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PCI Express 2.0 Specifications Released

PCI Express 2.0 Specifications Released

PC components Jan 16,2007 0

PCI-SIG, the Special Interest Group responsible for PCI Express industry-standard I/O technology, announced the availability of the PCI Express Base 2.0 specification. After a 60-day review of revision 0.9 of the specification in Fall 2006, members of the PCI-SIG finalized and released PCI Express (PCIe) 2.0, which doubles the interconnect bit rate from 2.5GT/s to 5GT/s to support high-bandwidth applications.

The specification extends the data rate to 5GT/s in a manner compatible with all existing PCIe 1.1 products currently supporting 2.5GT/s signaling. The key benefit of PCIe 2.0 is its faster signaling, effectively increasing the aggregate bandwidth of a 16-lane link to approximately 16 GB/s. The higher bandwidth will allow product designers to implement narrower interconnect links to achieve high performance while reducing cost.

In addition to the faster signaling rate, PCI-SIG working groups also added several new protocol layer improvements to the PCIe Base 2.0 specification. These architecture improvements include:

- Dynamic link speed management allows developers to control the speed at which the link is operating
- Link bandwidth notification alerts platform software (operating system, device drivers, etc) of changes in link speed and width
- Capability structure expansion increases control registers to better manage devices, slots and the interconnect
- Access control services allows for optional controls to manage peer-to-peer transactions
- Completion timeout control allows developers to define a required disable mechanism for transaction timeouts
- Function-level reset provides an optional mechanism to reset functions within a multi-function device
- Power limit redefinition enables slot power limit values to accommodate devices that consume higher power

The PCIe Base 2.0 specification is available for download at http://www.pcisig.com/specifications/pciexpress/base2/.

Tags: PCIePCI-SIG
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