Sata 3 Pci Express Card Controller Driver

  • USB 3.0 PCIe Add-on Card Installation. Locate the PCI-E slot on the motherboard. Insert the USB3.0 PCI-E Card into the PCI-E slot. Connect the disk drive power connectors from the system power supply to the USB3.0 PCI-E Card.
  • So I purchased a SATA 3 PCIe 1.0 card (Rosewill RC-227 PCI-Express 2.0 SATA III (6.0Gb/s) Controller Card) and connected it to one of my PCIe 2.0 slots. After I installed it would not work. Windows update found some kind of drivers for it but it shows up in my device manager as a floppy disk drive and a floppy controller.
  • 88SE14xx PCIe 3.0 to 6Gb/s SATA Host Controllers. The Marvell 88SE14xx family of PCIe to SATA 6Gb/s host controllers offers an ideal cost effective solution for connecting Serial ATA (SATA) peripherals to a PCI Express (PCIe) 3.0 host, delivering up to 8GB/s bandwidth.
PCI Express
Year created2003; 16 years ago
Created by
Supersedes
Width in bits1 per lane; 1–32 bonded lanes
No. of devicesOne device each on each endpoint of each connection. PCI Express switches can create multiple endpoints out of one endpoint to allow sharing one endpoint with multiple devices.
SpeedFor single-lane (×1) and 16-lane (×16) links, in each direction:
  • v. 1.x (2.5 GT/s):
  • v. 2.x (5 GT/s):
    • 500 MB/s (×1)
    • 8 GB/s (×16)
  • v. 3.x (8 GT/s):
  • v. 4.x (16 GT/s):
    • 1.969 GB/s (×1)
    • 31.51 GB/s (×16)
  • v. 5.x (32 GT/s):
  • v. 6.x (32 GT/s):
    • 8 GB/s (×1)
    • 128 GB/s (×16)
StyleSerial
Hotplugging interfaceYes, if ExpressCard, Mobile PCI Express Module, XQD card or Thunderbolt
External interfaceYes, with PCI Express OCuLink and External Cabling, such as Thunderbolt
Websitepcisig.com
Various slots on a computer motherboard, from top to bottom:

2 x Port SATA III 6Gb/s PCI Express RAID Card Controller Card. This SATA 6Gbps PCI Express RAID Card is a controller board that supports both low profile and regular-size PCI in one card. The PEXESAT322I PCI Express SATA III Controller Card (6 Gbps) gives you the option to add 2 internal or external SATA ports to your computer, through a single PCI Express (x1) card slot. The card features on board jumper selection, which enables you to configure the card to provide 2 internal or external SATA III ports, or one of each, as needed.

  • PCI Express ×4
  • PCI Express ×16
  • PCI Express ×1
  • PCI Express ×16
  • Conventional PCI (32-bit, 5 V)

PCI Express (Peripheral Component Interconnect Express), officially abbreviated as PCIe or PCI-e,[1] is a high-speed serialcomputerexpansion bus standard, designed to replace the older PCI, PCI-X and AGP bus standards. It is the common motherboard interface for personal computers' graphics cards, hard drives, SSDs, Wi-Fi and Ethernet hardware connections.[2] PCIe has numerous improvements over the older standards, including higher maximum system bus throughput, lower I/O pin count and smaller physical footprint, better performance scaling for bus devices, a more detailed error detection and reporting mechanism (Advanced Error Reporting, AER[3]), and native hot-swap functionality. More recent revisions of the PCIe standard provide hardware support for I/O virtualization.

Defined by its number of lanes,[4] the PCI Express electrical interface is also used in a variety of other standards, most notably the laptop expansion card interface ExpressCard and computer storage interfaces SATA Express, U.2 (SFF-8639) and M.2.

Format specifications are maintained and developed by the PCI-SIG (PCI Special Interest Group), a group of more than 900 companies that also maintain the conventional PCI specifications.

  • 1Architecture
  • 2Form factors
    • 2.1PCI Express (standard)
    • 2.2PCI Express Mini Card
    • 2.3PCI Express External Cabling
  • 3History and revisions
  • 4Hardware protocol summary
    • 4.1Physical layer
  • 5Applications

Architecture[edit]

An example of the PCI Express topology; white 'junction boxes' represent PCI Express device downstream ports, while the gray ones represent upstream ports.[5]:7
A PCI Express ×1 card containing a PCI Express switch (covered by a small heat sink), which creates multiple endpoints out of one endpoint and allows it to be shared by multiple devices

Conceptually, the PCI Express bus is a high-speed serial replacement of the older PCI/PCI-X bus.[6] One of the key differences between the PCI Express bus and the older PCI is the bus topology; PCI uses a shared parallelbus architecture, in which the PCI host and all devices share a common set of address, data and control lines. In contrast, PCI Express is based on point-to-point topology, with separate serial links connecting every device to the root complex (host). Because of its shared bus topology, access to the older PCI bus is arbitrated (in the case of multiple masters), and limited to one master at a time, in a single direction. Furthermore, the older PCI clocking scheme limits the bus clock to the slowest peripheral on the bus (regardless of the devices involved in the bus transaction). In contrast, a PCI Express bus link supports full-duplex communication between any two endpoints, with no inherent limitation on concurrent access across multiple endpoints.

In terms of bus protocol, PCI Express communication is encapsulated in packets. The work of packetizing and de-packetizing data and status-message traffic is handled by the transaction layer of the PCI Express port (described later). Radical differences in electrical signaling and bus protocol require the use of a different mechanical form factor and expansion connectors (and thus, new motherboards and new adapter boards); PCI slots and PCI Express slots are not interchangeable. At the software level, PCI Express preserves backward compatibility with PCI; legacy PCI system software can detect and configure newer PCI Express devices without explicit support for the PCI Express standard, though new PCI Express features are inaccessible.

The PCI Express link between two devices can vary in size from one to 32 lanes. In a multi-lane link, the packet data is striped across lanes, and peak data throughput scales with the overall link width. The lane count is automatically negotiated during device initialization, and can be restricted by either endpoint. For example, a single-lane PCI Express (×1) card can be inserted into a multi-lane slot (×4, ×8, etc.), and the initialization cycle auto-negotiates the highest mutually supported lane count. The link can dynamically down-configure itself to use fewer lanes, providing a failure tolerance in case bad or unreliable lanes are present. The PCI Express standard defines link widths of ×1, ×2, ×4, ×8, ×12, ×16 and ×32.[5]:4,5 This allows the PCI Express bus to serve both cost-sensitive applications where high throughput is not needed, and performance-critical applications such as 3D graphics, networking (10 Gigabit Ethernet or multiport Gigabit Ethernet), and enterprise storage (SAS or Fibre Channel). Slots and connectors are only defined for a subset of these widths, with link widths in between using the next larger physical slot size.

As a point of reference, a PCI-X (133 MHz 64-bit) device and a PCI Express 1.0 device using four lanes (×4) have roughly the same peak single-direction transfer rate of 1064 MB/s. The PCI Express bus has the potential to perform better than the PCI-X bus in cases where multiple devices are transferring data simultaneously, or if communication with the PCI Express peripheral is bidirectional.

Interconnect[edit]

A PCI Express link between two devices consists of one or more lanes, which are dual simplex channels using two differential signaling pairs.[5]:3

PCI Express devices communicate via a logical connection called an interconnect[7] or link. A link is a point-to-point communication channel between two PCI Express ports allowing both of them to send and receive ordinary PCI requests (configuration, I/O or memory read/write) and interrupts (INTx, MSI or MSI-X). At the physical level, a link is composed of one or more lanes.[7] Low-speed peripherals (such as an 802.11Wi-Ficard) use a single-lane (×1) link, while a graphics adapter typically uses a much wider and therefore faster 16-lane (×16) link.

Lane[edit]

A lane is composed of two differential signaling pairs, with one pair for receiving data and the other for transmitting. Thus, each lane is composed of four wires or signal traces. Conceptually, each lane is used as a full-duplexbyte stream, transporting data packets in eight-bit 'byte' format simultaneously in both directions between endpoints of a link.[8] Physical PCI Express links may contain from one to 32 lanes, more precisely 1, 2, 4, 8, 12, 16 or 32 lanes.[5]:4,5[7] Lane counts are written with an '×' prefix (for example, '×8' represents an eight-lane card or slot), with ×16 being the largest size in common use.[9] Lane sizes are also referred to via the terms 'width' or 'by' e.g., an eight-lane slot could be referred to as a 'by 8' or as '8 lanes wide.'

For mechanical card sizes, see below.

Serial bus[edit]

The bonded serial bus architecture was chosen over the traditional parallel bus because of inherent limitations of the latter, including half-duplex operation, excess signal count, and inherently lower bandwidth due to timing skew. Timing skew results from separate electrical signals within a parallel interface traveling through conductors of different lengths, on potentially different printed circuit board (PCB) layers, and at possibly different signal velocities. Despite being transmitted simultaneously as a single word, signals on a parallel interface have different travel duration and arrive at their destinations at different times. When the interface clock period is shorter than the largest time difference between signal arrivals, recovery of the transmitted word is no longer possible. Since timing skew over a parallel bus can amount to a few nanoseconds, the resulting bandwidth limitation is in the range of hundreds of megahertz.

A serial interface does not exhibit timing skew because there is only one differential signal in each direction within each lane, and there is no external clock signal since clocking information is embedded within the serial signal itself. As such, typical bandwidth limitations on serial signals are in the multi-gigahertz range. PCI Express is one example of the general trend toward replacing parallel buses with serial interconnects; other examples include Serial ATA (SATA), USB, Serial Attached SCSI (SAS), FireWire (IEEE 1394), and RapidIO. In digital video, examples in common use are DVI, HDMI and DisplayPort.

Multichannel serial design increases flexibility with its ability to allocate fewer lanes for slower devices.

Form factors[edit]

PCI Express (standard)[edit]

Intel P3608 NVMe flash SSD, PCI-E add-in card

A PCI Express card fits into a slot of its physical size or larger (with ×16 as the largest used), but may not fit into a smaller PCI Express slot; for example, a ×16 card may not fit into a ×4 or ×8 slot. Some slots use open-ended sockets to permit physically longer cards and negotiate the best available electrical and logical connection.

The number of lanes actually connected to a slot may also be fewer than the number supported by the physical slot size. An example is a ×16 slot that runs at ×4, which will accept any ×1, ×2, ×4, ×8 or ×16 card, but provides only four lanes. Its specification may read as '×16 (×4 mode)', while '×size @ ×speed' notation ('×16 @ ×4') is also common. The advantage is that such slots can accommodate a larger range of PCI Express cards without requiring motherboard hardware to support the full transfer rate. Standard mechanical sizes are ×1, ×4, ×8, and ×16. Cards with a differing number of lanes need to use the next larger mechanical size (ie. a ×2 card uses the ×4 size, or a ×12 card uses the ×16 size).

The cards themselves are designed and manufactured in various sizes. For example, solid-state drives (SSDs) that come in the form of PCI Express cards often use HHHL (half height, half length) and FHHL (full height, half length) to describe the physical dimensions of the card.[10][11]

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PCI TypeDimensions (mm)Dimensions (in)
Full-Length PCI Card107mm (height) × 312mm (long)4.21in (height) × 12.28in (long)
Half-Length PCI Card106.68mm (height) × 175.26mm (long)4.2in (height) × 6.9in (long)
Low-Profile/ Slim PCI Card64.41mm (height) × 119.91–167.64mm (long)2.54in (height) × 4.72–6.59in (long)

Pinout[edit]

The following table identifies the conductors on each side of the edge connector on a PCI Express card. The solder side of the printed circuit board (PCB) is the A side, and the component side is the B side.[12] PRSNT1# and PRSNT2# pins must be slightly shorter than the rest, to ensure that a hot-plugged card is fully inserted. The WAKE# pin uses full voltage to wake the computer, but must be pulled high from the standby power to indicate that the card is wake capable.[13]

PCI Express connector pinout (×1, ×4, ×8 and ×16 variants)
PinSide BSide ADescriptionPinSide BSide ADescription
1+12 VPRSNT1#Must connect to farthest PRSNT2# pin50HSOp(8)ReservedLane 8 transmit data, + and −
2+12 V+12 VMain power pins51HSOn(8)Ground
3+12 V+12 V52GroundHSIp(8)Lane 8 receive data, + and −
4GroundGround53GroundHSIn(8)
5SMCLKTCKSMBus and JTAG port pins54HSOp(9)GroundLane 9 transmit data, + and −
6SMDATTDI55HSOn(9)Ground
7GroundTDO56GroundHSIp(9)Lane 9 receive data, + and −
8+3.3 VTMS57GroundHSIn(9)
9TRST#+3.3 V58HSOp(10)GroundLane 10 transmit data, + and −
10+3.3 V aux+3.3 VStandby power59HSOn(10)Ground
11WAKE#PERST#Link reactivation; fundamental reset60GroundHSIp(10)Lane 10 receive data, + and −
Key notch61GroundHSIn(10)
12CLKREQ#[14]GroundClock Request Signal62HSOp(11)GroundLane 11 transmit data, + and −
13GroundREFCLK+Reference clock differential pair63HSOn(11)Ground
14HSOp(0)REFCLK−Lane 0 transmit data, + and −64GroundHSIp(11)Lane 11 receive data, + and −
15HSOn(0)Ground65GroundHSIn(11)
16GroundHSIp(0)Lane 0 receive data, + and −66HSOp(12)GroundLane 12 transmit data, + and −
17PRSNT2#HSIn(0)67HSOn(12)Ground
18GroundGround68GroundHSIp(12)Lane 12 receive data, + and −
PCI Express ×1 cards end at pin 1869GroundHSIn(12)
19HSOp(1)ReservedLane 1 transmit data, + and −70HSOp(13)GroundLane 13 transmit data, + and −
20HSOn(1)Ground71HSOn(13)Ground
21GroundHSIp(1)Lane 1 receive data, + and −72GroundHSIp(13)Lane 13 receive data, + and −
22GroundHSIn(1)73GroundHSIn(13)
23HSOp(2)GroundLane 2 transmit data, + and −74HSOp(14)GroundLane 14 transmit data, + and −
24HSOn(2)Ground75HSOn(14)Ground
25GroundHSIp(2)Lane 2 receive data, + and −76GroundHSIp(14)Lane 14 receive data, + and −
26GroundHSIn(2)77GroundHSIn(14)
27HSOp(3)GroundLane 3 transmit data, + and −78HSOp(15)GroundLane 15 transmit data, + and −
28HSOn(3)Ground79HSOn(15)Ground
29GroundHSIp(3)Lane 3 receive data, + and −80GroundHSIp(15)Lane 15 receive data, + and −
30PWRBRK#[15]HSIn(3)81PRSNT2#HSIn(15)
31PRSNT2#Ground82ReservedGround
32GroundReserved
PCI Express ×4 cards end at pin 32
33HSOp(4)ReservedLane 4 transmit data, + and −
34HSOn(4)Ground
35GroundHSIp(4)Lane 4 receive data, + and −
36GroundHSIn(4)
37HSOp(5)GroundLane 5 transmit data, + and −
38HSOn(5)Ground
39GroundHSIp(5)Lane 5 receive data, + and −
40GroundHSIn(5)
41HSOp(6)GroundLane 6 transmit data, + and −
42HSOn(6)Ground
43GroundHSIp(6)Lane 6 receive data, + and −Legend
44GroundHSIn(6)Ground pinZero volt reference
45HSOp(7)GroundLane 7 transmit data, + and −Power pinSupplies power to the PCIe card
46HSOn(7)GroundCard-to-host pinSignal from the card to the motherboard
47GroundHSIp(7)Lane 7 receive data, + and −Host-to-card pinSignal from the motherboard to the card
48PRSNT2#HSIn(7)Open drainMay be pulled low or sensed by multiple cards
49GroundGroundSense pinTied together on card
PCI Express ×8 cards end at pin 49ReservedNot presently used, do not connect

Power[edit]

8-pin (left) and 6-pin (right) power connectors used on PCI Express cards

All PCI express cards may consume up to 3 A at +3.3 V (9.9 W). The amount of +12 V and total power they may consume depends on the type of card:[16]:35–36[17]

  • ×1 cards are limited to 0.5 A at +12V (6 W) and 10 W combined.
  • ×4 and wider cards are limited to 2.1 A at +12V (25 W) and 25 W combined.
  • A full-sized ×1 card may draw up to the 25 W limits after initialization and software configuration as a 'high power device'.
  • A full-sized ×16 graphics card[13] may draw up to 5.5 A at +12V (66 W) and 75 W combined after initialization and software configuration as a 'high power device'.

Optional connectors add 75 W (6-pin) or 150 W (8-pin) of +12 V power for up to 300 W total (2×75 W + 1×150 W).

Pci express sata controller card
  • Sense0 pin is connected to ground by the cable or power supply, or float on board if cable is not connected.
  • Sense1 pin is connected to ground by the cable or power supply, or float on board if cable is not connected.

There are cards that use two 8-pin connectors, but this has not been standardized yet as of 2018, therefore such cards must not carry the official PCI Express logo. This configuration allows 375 W total (1×75 W + 2×150 W) and will likely be standardized by PCI-SIG with the PCI Express 4.0 standard. The 8-pin PCI Express connector could be confused with the EPS12V connector, which is mainly used for powering SMP and multi-core systems.

6-pin power connector (75 W)[18]8-pin power connector (150 W)[19][20][21]
6 pin power connector pin map
8 pin power connector pin map
PinDescriptionPinDescription
1+12 V1+12 V
2Not connected (usually +12 V as well)2+12 V
3+12 V3+12 V
4Sense1 (8-pin connected[a])
4Ground5Ground
5Sense6Sense0 (6-pin or 8-pin connected)
6Ground7Ground
8Ground
  1. ^When a 6-pin connector is plugged into an 8-pin receptacle the card is notified by a missing Sense1 that it may only use up to 75 W.

PCI Express Mini Card[edit]

A WLAN PCI Express Mini Card and its connector
MiniPCI and MiniPCI Express cards in comparison

PCI Express Mini Card (also known as Mini PCI Express, Mini PCIe, Mini PCI-E, mPCIe, and PEM), based on PCI Express, is a replacement for the Mini PCI form factor. It is developed by the PCI-SIG. The host device supports both PCI Express and USB 2.0 connectivity, and each card may use either standard. Most laptop computers built after 2005 use PCI Express for expansion cards; however, as of 2015, many vendors are moving toward using the newer M.2 form factor for this purpose.

Due to different dimensions, PCI Express Mini Cards are not physically compatible with standard full-size PCI Express slots; however, passive adapters exist that allow them to be used in full-size slots.[22]

Physical dimensions[edit]

Dimensions of PCI Express Mini Cards are 30 × 50.95 mm (width × length) for a Full Mini Card. There is a 52-pin edge connector, consisting of two staggered rows on a 0.8 mm pitch. Each row has eight contacts, a gap equivalent to four contacts, then a further 18 contacts. Boards have a thickness of 1.0 mm, excluding the components. A 'Half Mini Card' (sometimes abbreviated as HMC) is also specified, having approximately half the physical length of 26.8 mm.

Electrical interface[edit]

PCI Express Mini Card edge connectors provide multiple connections and buses:

  • PCI Express ×1 (with SMBus)
  • USB 2.0
  • Wires to diagnostics LEDs for wireless network (i.e., Wi-Fi) status on computer's chassis
  • SIM card for GSM and WCDMA applications (UIM signals on spec.).
  • Future extension for another PCIe lane
  • 1.5 V and 3.3 V power

Mini-SATA (mSATA) variant[edit]

Despite sharing the Mini PCI Express form factor, an mSATA slot is not necessarily electrically compatible with Mini PCI Express. For this reason, only certain notebooks are compatible with mSATA drives. Most compatible systems are based on Intel's Sandy Bridge processor architecture, using the Huron River platform. Notebooks such as Lenovo's ThinkPad T, W and X series, released in March–April 2011, have support for an mSATA SSD card in their WWAN card slot. The ThinkPad Edge E220s/E420s, and the Lenovo IdeaPad Y460/Y560/Y570/Y580 also support mSATA.[23]

Some notebooks (notably the Asus Eee PC, the AppleMacBook Air, and the Dell mini9 and mini10) use a variant of the PCI Express Mini Card as an SSD. This variant uses the reserved and several non-reserved pins to implement SATA and IDE interface passthrough, keeping only USB, ground lines, and sometimes the core PCIe ×1 bus intact.[24] This makes the 'miniPCIe' flash and solid-state drives sold for netbooks largely incompatible with true PCI Express Mini implementations.

Also, the typical Asus miniPCIe SSD is 71 mm long, causing the Dell 51 mm model to often be (incorrectly) referred to as half length. A true 51 mm Mini PCIe SSD was announced in 2009, with two stacked PCB layers that allow for higher storage capacity. The announced design preserves the PCIe interface, making it compatible with the standard mini PCIe slot. No working product has yet been developed.

Intel has numerous desktop boards with the PCIe ×1 Mini-Card slot which typically do not support mSATA SSD. A list of desktop boards that natively support mSATA in the PCIe ×1 Mini-Card slot (typically multiplexed with a SATA port) is provided on the Intel Support site.[25]

PCI Express M.2 (Mini PCIe v2)[edit]

The new version of Mini PCI express, M.2 replaces the mSATA standard. Computer bus interfaces provided through the M.2 connector are PCI Express 3.0 (up to four lanes), Serial ATA 3.0, and USB 3.0 (a single logical port for each of the latter two). It is up to the manufacturer of the M.2 host or device to select which interfaces are to be supported, depending on the desired level of host support and device type.

PCI Express External Cabling[edit]

PCI Express External Cabling (also known as External PCI Express, Cabled PCI Express, or ePCIe) specifications were released by the PCI-SIG in February 2007.[26][27]

Standard cables and connectors have been defined for ×1, ×4, ×8, and ×16 link widths, with a transfer rate of 250 MB/s per lane. The PCI-SIG also expects the norm will evolve to reach 500 MB/s, as in PCI Express 2.0. An example of the uses of Cabled PCI Express is a metal enclosure, containing a number of PCIe slots and PCIe-to-ePCIe adapter circuitry. This device would not be possible had it not been for the ePCIe spec.

PCI Express OCuLink[edit]

OCuLink (standing for 'optical-copper link', since Cu is the chemical symbol for Copper) is an extension for the 'cable version of PCI Express', acting as a competitor to version 3 of the Thunderbolt interface. Version 1.0 of OCuLink, released in Oct 2015, supports up to PCIe 3.0 ×4 lanes (8 GT/s, 3.9 GB/s) over copper cabling; a fiber optic version may appear in the future.[28][29]

OCuLink in last version will have up to 16 GT/s (8 GB/s total for ×4 lanes),[30] while the maximum bandwidth of a Thunderbolt 3 connector is 5 GB/s.

Derivative forms[edit]

Several other types of expansion card are derived from PCIe; these include:

  • Low-height card
  • ExpressCard: Successor to the PC Card form factor (with ×1 PCIe and USB 2.0; hot-pluggable)
  • PCI Express ExpressModule: A hot-pluggable modular form factor defined for servers and workstations
  • XQD card: A PCI Express-based flash card standard by the CompactFlash Association
  • XMC: Similar to the CMC/PMC form factor (VITA 42.3)
  • AdvancedTCA: A complement to CompactPCI for larger applications; supports serial based backplane topologies
  • AMC: A complement to the AdvancedTCA specification; supports processor and I/O modules on ATCA boards (×1, ×2, ×4 or ×8 PCIe).
  • FeaturePak: A tiny expansion card format (43 × 65 mm) for embedded and small-form-factor applications which implements two ×1 PCIe links on a high-density connector along with USB, I2C, and up to 100 points of I/O
  • Universal IO: A variant from Super Micro Computer Inc designed for use in low-profile rack-mounted chassis.[31] It has the connector bracket reversed so it cannot fit in a normal PCI Express socket, but it is pin-compatible and may be inserted if the bracket is removed.
  • Thunderbolt: A variant from Intel that combines DisplayPort and PCIe protocols in a form factor compatible with Mini DisplayPort. Thunderbolt 3.0 also combines USB 3.1 and uses the USB-C form factor as opposed to Mini DisplayPort.
  • Serial Digital Video Out: Some 9xx series Intel chipsets allow for adding another output for the integrated video into a PCIe slot (mostly dedicated and 16 lanes).
  • M.2 (formerly known as NGFF)
  • M-PCIe brings PCIe 3.0 to mobile devices (such as tablets and smartphones), over the M-PHY physical layer.[32][28]
  • U.2 (formerly known as SFF-8639)

History and revisions[edit]

While in early development, PCIe was initially referred to as HSI (for High Speed Interconnect), and underwent a name change to 3GIO (for 3rd Generation I/O) before finally settling on its PCI-SIG name PCI Express. A technical working group named the Arapaho Work Group (AWG) drew up the standard. For initial drafts, the AWG consisted only of Intel engineers; subsequently, the AWG expanded to include industry partners.

Since, PCIe has undergone several large and smaller revisions, improving on performance and other features.

PCI Express link performance[33][34]
PCI Express
version
IntroducedLine
code
Transfer
rate[i]
Throughput[i]
×1×2×4×8×16
1.020038b/10b2.5 GT/s250 MB/s0.50 GB/s1.0 GB/s2.0 GB/s4.0 GB/s
2.020078b/10b5.0 GT/s500 MB/s1.0 GB/s2.0 GB/s4.0 GB/s8.0 GB/s
3.02010128b/130b8.0 GT/s984.6 MB/s1.97 GB/s3.94 GB/s7.88 GB/s15.75 GB/s
4.02017128b/130b16.0 GT/s1969 MB/s3.94 GB/s7.88 GB/s15.75 GB/s31.51 GB/s
5.02019128b/130b32.0 GT/s[ii]3938 MB/s7.88 GB/s15.75 GB/s31.51 GB/s63.02 GB/s
6.0 (planned)2021128b/130b64.0 GT/s7877 MB/s15.75 GB/s31.51 GB/s63.02 GB/s126.03 GB/s
  1. ^ abIn each direction (each lane is a dual simplex channel).
  2. ^Initially, 25.0 GT/s was also considered for technical feasibility.

PCI Express 1.0a[edit]

In 2003, PCI-SIG introduced PCIe 1.0a, with a per-lane data rate of 250 MB/s and a transfer rate of 2.5 gigatransfers per second (GT/s). Transfer rate is expressed in transfers per second instead of bits per second because the number of transfers includes the overhead bits, which do not provide additional throughput;[35] PCIe 1.x uses an 8b/10b encoding scheme, resulting in a 20% (= 2/10) overhead on the raw channel bandwidth.[36]

PCI Express 1.1[edit]

In 2005, PCI-SIG[37] introduced PCIe 1.1. This updated specification includes clarifications and several improvements, but is fully compatible with PCI Express 1.0a. No changes were made to the data rate.

PCI Express 2.0[edit]

A PCI Express 2.0 expansion card that provides USB 3.0 connectivity.[a]

PCI-SIG announced the availability of the PCI Express Base 2.0 specification on 15 January 2007.[38] The PCIe 2.0 standard doubles the transfer rate compared with PCIe 1.0 to 5 GT/s and the per-lane throughput rises from 250 MB/s to 500 MB/s. Consequently, a 32-lane PCIe connector (×32) can support an aggregate throughput of up to 16 GB/s.

PCIe 2.0 motherboard slots are fully backward compatible with PCIe v1.x cards. PCIe 2.0 cards are also generally backward compatible with PCIe 1.x motherboards, using the available bandwidth of PCI Express 1.1. Overall, graphic cards or motherboards designed for v2.0 will work with the other being v1.1 or v1.0a.

The PCI-SIG also said that PCIe 2.0 features improvements to the point-to-point data transfer protocol and its software architecture.[39]

Intel's first PCIe 2.0 capable chipset was the X38 and boards began to ship from various vendors (Abit, Asus, Gigabyte) as of October 21, 2007.[40] AMD started supporting PCIe 2.0 with its AMD 700 chipset series and nVidia started with the MCP72.[41] All of Intel's prior chipsets, including the Intel P35 chipset, supported PCIe 1.1 or 1.0a.[42]

Like 1.x, PCIe 2.0 uses an 8b/10b encoding scheme, therefore delivering, per-lane, an effective 4 Gbit/s max transfer rate from its 5 GT/s raw data rate.

PCI Express 2.1[edit]

PCI Express 2.1 (with its specification dated March 4, 2009) supports a large proportion of the management, support, and troubleshooting systems planned for full implementation in PCI Express 3.0. However, the speed is the same as PCI Express 2.0. The increase in power from the slot breaks backward compatibility between PCI Express 2.1 cards and some older motherboards with 1.0/1.0a, but most motherboards with PCI Express 1.1 connectors are provided with a BIOS update by their manufacturers through utilities to support backward compatibility of cards with PCIe 2.1.

PCI Express 3.0[edit]

PCI Express 3.0 Base specification revision 3.0 was made available in November 2010, after multiple delays. In August 2007, PCI-SIG announced that PCI Express 3.0 would carry a bit rate of 8 gigatransfers per second (GT/s), and that it would be backward compatible with existing PCI Express implementations. At that time, it was also announced that the final specification for PCI Express 3.0 would be delayed until Q2 2010.[43] New features for the PCI Express 3.0 specification include a number of optimizations for enhanced signaling and data integrity, including transmitter and receiver equalization, PLL improvements, clock data recovery, and channel enhancements for currently supported topologies.[44]

Following a six-month technical analysis of the feasibility of scaling the PCI Express interconnect bandwidth, PCI-SIG's analysis found that 8 gigatransfers per second can be manufactured in mainstream silicon process technology, and can be deployed with existing low-cost materials and infrastructure, while maintaining full compatibility (with negligible impact) to the PCI Express protocol stack.

PCI Express 3.0 upgrades the encoding scheme to 128b/130b from the previous 8b/10b encoding, reducing the bandwidth overhead from 20% of PCI Express 2.0 to approximately 1.54% (= 2/130). A desirable balance of 0 and 1 bits in the data stream is achieved by XORing a known binary polynomial as a 'scrambler' to the data stream in a feedback topology. Marketing for dummies pdf free download. Because the scrambling polynomial is known, the data can be recovered by applying the XOR a second time. Both the scrambling and descrambling steps are carried out in hardware. PCI Express 3.0's 8 GT/s bit rate effectively delivers 985 MB/s per lane, nearly doubling the lane bandwidth relative to PCI Express 2.0.[34]

On November 18, 2010, the PCI Special Interest Group officially published the finalized PCI Express 3.0 specification to its members to build devices based on this new version of PCI Express.[45]

PCI Express 3.1[edit]

In September 2013, PCI Express 3.1 specification was announced to be released in late 2013 or early 2014, consolidating various improvements to the published PCI Express 3.0 specification in three areas: power management, performance and functionality.[28][46] It was released in November 2014.[47]

PCI Express 4.0[edit]

On November 29, 2011, PCI-SIG preliminarily announced PCI Express 4.0,[48] providing a 16 GT/s bit rate that doubles the bandwidth provided by PCI Express 3.0, while maintaining backward and forward compatibility in both software support and used mechanical interface.[49] PCI Express 4.0 specs will also bring OCuLink-2, an alternative to Thunderbolt connector. OCuLink version 2 will have up to 16 GT/s (8 GB/s total for ×4 lanes),[30] while the maximum bandwidth of a Thunderbolt 3 connector is 5 GB/s. Additionally, active and idle power optimizations are to be investigated.

In August 2016, Synopsys presented a test machine running PCIe 4.0 at the Intel Developer Forum. Their IP has been licensed to several firms planning to present their chips and products at the end of 2016.[50][51]

PCI Express 4.0 was officially announced on June 8, 2017, by PCI-SIG.[52] The spec includes improvements in flexibility, scalability, and lower-power.

NETINT Technologies introduced the first NVMe SSD based on PCIe 4.0 on July 17, 2018, ahead of Flash Memory Summit 2018[53]

Broadcom announced on 12 September 2018 the first 200 Gbit Ethernet Controller with PCIe 4.0.[54]

AMD announced on 9 January 2019 their upcoming X570 chipset will support PCIe 4.0.[55] AMD planned to enable partial support for older chipsets, but they retracted that promise because of the instability caused by PCIe 4.0.[56][57]

PCI Express 5.0[edit]

In June 2017, PCI-SIG preliminarily announced the PCI Express 5.0 specification.[52] Bandwidth is expected to increase to 32 GT/s, yielding 63 GB/s in each direction in a 16 lane configuration. It is expected to be standardized in 2019.

PLDA announced the availability of their XpressRICH5 PCIe 5.0 Controller IP based on draft 0.7 of the PCIe 5.0 specification on the same day.[58][59]

On 10 December 2018, the PCI SIG released version 0.9 of the PCIe 5.0 specification to its members.[60]

On 17 January 2019, the PCI SIG announced the version 0.9 of the PCIe 5.0 specification has been ratified, and the version 1.0 is targeted for release in the first quarter of 2019.[61]

On 29 May 2019, PCI-SIG officially announced the release of the final PCI-Express 5.0 specification.[62]

PCI Express 6.0[edit]

On June 18 2019, PCI-SIG announced the development of PCI Express 6.0 specification that will double the data rate to 64 GT/s, yielding 128 GB/s in each direction in a 16 lane configuration, with a target release date of 2021.[63] The new standard uses 4-level pulse-amplitude modulation (PAM-4) with a low-latency forward error correction (FEC) in place of non-return-to-zero (NRZ) modulation.[64]

Extensions and future directions[edit]

Some vendors offer PCIe over fiber products,[65][66][67] but these generally find use only in specific cases where transparent PCIe bridging is preferable to using a more mainstream standard (such as InfiniBand or Ethernet) that may require additional software to support it; current implementations focus on distance rather than raw bandwidth and typically do not implement a full ×16 link.

Thunderbolt was co-developed by Intel and Apple as a general-purpose high speed interface combining a ×4 PCIe link with DisplayPort and was originally intended to be an all-fiber interface, but due to early difficulties in creating a consumer-friendly fiber interconnect, nearly all implementations are copper systems. A notable exception, the Sony VAIO Z VPC-Z2, uses a nonstandard USB port with an optical component to connect to an outboard PCIe display adapter. Apple has been the primary driver of Thunderbolt adoption through 2011, though several other vendors[68] have announced new products and systems featuring Thunderbolt. Thunderbolt 3 will become part of USB 4 standard.

Mobile PCIe specification (abbreviated to M-PCIe) allows PCI Express architecture to operate over the MIPI Alliance's M-PHY physical layer technology. Building on top of already existing widespread adoption of M-PHY and its low-power design, Mobile PCIe allows PCI Express to be used in tablets and smartphones.[69]

Draft process[edit]

There are 5 primary releases/checkpoints in a PCI-SIG specification:[70]

  • Draft 0.3 (Concept): this release may have few details, but outlines the general approach and goals.
  • Draft 0.5 (First draft): this release has a complete set of architectural requirements and must fully address the goals set out in the 0.3 draft.
  • Draft 0.7 (Complete draft): this release must have a complete set of functional requirements and methods defined, and no new functionality may be added to the specification after this release. Before the release of this draft, electrical specifications must have been validated via test silicon.
  • Draft 0.9 (Final draft): this release allows PCI-SIG member companies to perform an internal review for intellectual property, and no functional changes are permitted after this draft.
  • 1.0 (Final release): this is the final and definitive specification, and any changes or enhancements will be through Errata documentation and Engineering Change Notices (ECNs) respectively.

Historically, the earliest adopters of a new PCIe specification generally begin designing with the Draft 0.5 as they can confidently build up their application logic around the new bandwidth definition and often even start developing for any new protocol features. At the Draft 0.5 stage, however, there is still a strong likelihood of changes in the actual PCIe protocol layer implementation, so designers responsible for developing these blocks internally may be more hesitant to begin work than those using interface IP from external sources.

Hardware protocol summary[edit]

The PCIe link is built around dedicated unidirectional couples of serial (1-bit), point-to-point connections known as lanes. This is in sharp contrast to the earlier PCI connection, which is a bus-based system where all the devices share the same bidirectional, 32-bit or 64-bit parallel bus.

PCI Express is a layered protocol, consisting of a transaction layer, a data link layer, and a physical layer. The Data Link Layer is subdivided to include a media access control (MAC) sublayer. The Physical Layer is subdivided into logical and electrical sublayers. The Physical logical-sublayer contains a physical coding sublayer (PCS). The terms are borrowed from the IEEE 802 networking protocol model.

Physical layer[edit]

Connector pins and lengths
LanesPinsLength
TotalVariableTotalVariable
×12×18 = 36[71]2×7 = 1425 mm7.65 mm
×42×32 = 642×21 = 4239 mm21.65 mm
×82×49 = 982×38 = 7656 mm38.65 mm
×162×82 = 1642×71 = 14289 mm71.65 mm
An open-end PCI Express ×1 connector, allowing longer cards capable of using more lanes to be plugged while operating at ×1 speeds

The PCIe Physical Layer (PHY, PCIEPHY, PCI Express PHY, or PCIe PHY) specification is divided into two sub-layers, corresponding to electrical and logical specifications. The logical sublayer is sometimes further divided into a MAC sublayer and a PCS, although this division is not formally part of the PCIe specification. A specification published by Intel, the PHY Interface for PCI Express (PIPE),[72] defines the MAC/PCS functional partitioning and the interface between these two sub-layers. The PIPE specification also identifies the physical media attachment (PMA) layer, which includes the serializer/deserializer (SerDes) and other analog circuitry; however, since SerDes implementations vary greatly among ASIC vendors, PIPE does not specify an interface between the PCS and PMA.

At the electrical level, each lane consists of two unidirectional differential pairs operating at 2.5, 5, 8 or 16 Gbit/s, depending on the negotiated capabilities. Transmit and receive are separate differential pairs, for a total of four data wires per lane.

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A connection between any two PCIe devices is known as a link, and is built up from a collection of one or more lanes. All devices must minimally support single-lane (×1) link. Devices may optionally support wider links composed of 2, 4, 8, 12, 16, or 32 lanes. This allows for very good compatibility in two ways:

  • A PCIe card physically fits (and works correctly) in any slot that is at least as large as it is (e.g., an ×1 sized card will work in any sized slot);
  • A slot of a large physical size (e.g., ×16) can be wired electrically with fewer lanes (e.g., ×1, ×4, ×8, or ×12) as long as it provides the ground connections required by the larger physical slot size.

In both cases, PCIe negotiates the highest mutually supported number of lanes. Many graphics cards, motherboards and BIOS versions are verified to support ×1, ×4, ×8 and ×16 connectivity on the same connection.

Even though the two would be signal-compatible, it is not usually possible to place a physically larger PCIe card (e.g., a ×16 sized card) into a smaller slot – though if the PCIe slots are altered or a riser is used most motherboards will allow this. The width of a PCIe connector is 8.8 mm, while the height is 11.25 mm, and the length is variable. The fixed section of the connector is 11.65 mm in length and contains two rows of 11 (22 pins total), while the length of the other section is variable depending on the number of lanes. The pins are spaced at 1 mm intervals, and the thickness of the card going into the connector is 1.6 mm.[73][74]

Data transmission[edit]

PCIe sends all control messages, including interrupts, over the same links used for data. The serial protocol can never be blocked, so latency is still comparable to conventional PCI, which has dedicated interrupt lines.

Data transmitted on multiple-lane links is interleaved, meaning that each successive byte is sent down successive lanes. The PCIe specification refers to this interleaving as data striping. While requiring significant hardware complexity to synchronize (or deskew) the incoming striped data, striping can significantly reduce the latency of the nth byte on a link. While the lanes are not tightly synchronized, there is a limit to the lane to lane skew of 20/8/6 ns for 2.5/5/8 GT/s so the hardware buffers can re-align the striped data.[75] Due to padding requirements, striping may not necessarily reduce the latency of small data packets on a link.

As with other high data rate serial transmission protocols, the clock is embedded in the signal. At the physical level, PCI Express 2.0 utilizes the 8b/10b encoding scheme[34] to ensure that strings of consecutive identical digits (zeros or ones) are limited in length. This coding was used to prevent the receiver from losing track of where the bit edges are. In this coding scheme every eight (uncoded) payload bits of data are replaced with 10 (encoded) bits of transmit data, causing a 20% overhead in the electrical bandwidth. To improve the available bandwidth, PCI Express version 3.0 instead uses 128b/130b encoding with scrambling. 128b/130b encoding relies on the scrambling to limit the run length of identical-digit strings in data streams and ensure the receiver stays synchronised to the transmitter. It also reduces electromagnetic interference (EMI) by preventing repeating data patterns in the transmitted data stream.

Data link layer[edit]

The data link layer performs three vital services for the PCIe express link:

  1. sequence the transaction layer packets (TLPs) that are generated by the transaction layer,
  2. ensure reliable delivery of TLPs between two endpoints via an acknowledgement protocol (ACK and NAK signaling) that explicitly requires replay of unacknowledged/bad TLPs,
  3. initialize and manage flow control credits

On the transmit side, the data link layer generates an incrementing sequence number for each outgoing TLP. It serves as a unique identification tag for each transmitted TLP, and is inserted into the header of the outgoing TLP. A 32-bit cyclic redundancy check code (known in this context as Link CRC or LCRC) is also appended to the end of each outgoing TLP.

On the receive side, the received TLP's LCRC and sequence number are both validated in the link layer. If either the LCRC check fails (indicating a data error), or the sequence-number is out of range (non-consecutive from the last valid received TLP), then the bad TLP, as well as any TLPs received after the bad TLP, are considered invalid and discarded. The receiver sends a negative acknowledgement message (NAK) with the sequence-number of the invalid TLP, requesting re-transmission of all TLPs forward of that sequence-number. If the received TLP passes the LCRC check and has the correct sequence number, it is treated as valid. The link receiver increments the sequence-number (which tracks the last received good TLP), and forwards the valid TLP to the receiver's transaction layer. An ACK message is sent to remote transmitter, indicating the TLP was successfully received (and by extension, all TLPs with past sequence-numbers.)

If the transmitter receives a NAK message, or no acknowledgement (NAK or ACK) is received until a timeout period expires, the transmitter must retransmit all TLPs that lack a positive acknowledgement (ACK). Barring a persistent malfunction of the device or transmission medium, the link-layer presents a reliable connection to the transaction layer, since the transmission protocol ensures delivery of TLPs over an unreliable medium.

In addition to sending and receiving TLPs generated by the transaction layer, the. Archived from the original on 2017-03-24. Retrieved 2017-03-23.CS1 maint: Archived copy as title (link)

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  • ^'Archived copy'. Archived from the original on 2016-11-28. Retrieved 2016-12-17.CS1 maint: Archived copy as title (link)
  • ^Evan Koblentz (February 3, 2017). 'New PCI Express 4.0 delay may empower next-gen alternatives'. Tech Republic. Archived from the original on April 1, 2017. Retrieved March 31, 2017.
  • Sata 3 Pci Express Card

  • ^Compute Express Link (CXL) site
  • ^'Integrators List | PCI-SIG'. pcisig.com. Retrieved 2019-03-27.
  • Further reading[edit]

    • Budruk, Ravi; Anderson, Don; Shanley, Tom (2003), Winkles, Joseph ‘Joe’ (ed.), PCI Express System Architecture, Mind share PC system architecture, Addison-Wesley, ISBN978-0-321-15630-3 1120 pp.
    • Solari, Edward; Congdon, Brad (2003), Complete PCI Express Reference: Design Implications for Hardware and Software Developers, Intel, ISBN978-0-9717861-9-6, 1056 pp.
    • Wilen, Adam; Schade, Justin P; Thornburg, Ron (Apr 2003), Introduction to PCI Express: A Hardware and Software Developer's Guide, Intel, ISBN978-0-9702846-9-3, 325 pp.


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