Version 1.2 2007
Features
PEX 8512
Flexible & Versatile PCI Express® Switch
PEX 8512 General Features
o 12-lane PCI Express switch
- Integrated SerDes
o Up to five ports
o 23mm x 23mm, 376-ball PBGA
package
o Typical Power: 2.0 Watts
Multi-purpose, Feature Rich ExpressLane™ PCI Express Switch
The ExpressLane PEX 8512 device offers PCI Express switching capability
enabling users to add scalable high bandwidth, non-blocking interconnection
to a wide variety of applications including servers, storage systems,
communications platforms, blade servers, and embedded-control
products. The PEX 8512 is well suited for fan-out, aggregation, peer-to-
peer, and intelligent I/O module applications.
PEX 8512 Key Features
o Standards Compliant
- PCI Express Base Specification, r1.1
- Standard SHPC Specification, r1.1
(hot-plug)
o High Performance
Highly Flexible Port Configurations
- Non-blocking internal architecture
- Full line rate on all ports
- Cut-Thru latency: 150ns
o Non-Transparent Bridging
- Configurable Non-Transparent port
for Multi-Host or Intelligent I/O
Support
o Flexible Configuration
- Up to Five configurable ports (x1, x2
and x4)
- Configurable with strapping pins,
EEPROM, I2C, or Host software
- Lane and polarity reversal
o PCI Express Power Management
- Link power management states: L0,
L0s, L1, L2/L3 Ready, L2 and L3
- Device states: D0 and D3hot
- Vaux, WAKE#, Beacon support
o Spread Spectrum Clock
- Dual clock domain
o Quality of Service (QoS)
- Two Virtual Channels per port
- Eight Traffic Classes per port
- Fixed and Round-Robin Virtual
Channel Port Arbitration
The PEX 8512 offers 12 lanes which can be distributed into three ports or
five ports. In the case of three ports, the ports are configured for symmetric
(each port having the same lane width). The PEX 8512 features a flexible
central packet memory that allocates a memory buffer for each port as
required by the application or endpoint. This buffer allocation along with the
device's flexible packet flow control minimizes bottlenecks when the
upstream and aggregated downstream bandwidths do not match. Any of the
ports can be designated as the upstream port, which can be changed
dynamically.
End-to-end Packet Integrity
The PEX 8512 provides end-to-end CRC protection (ECRC) and Poison bit
support to enable designs that require guaranteed error-free packets. These
features are optional in the PCI Express specification, but PLX provides
them across its entire ExpressLane switch product line.
Non-Transparent “Bridging” in a PCI Express Switch
The PEX 8512 supports full non-transparent bridging (NTB) functionality to
allow implementation of multi-host systems and intelligent I/O modules in
applications such as communications, storage, and blade servers. To
ensure quick product migration, the non-transparency features are
implemented in the same fashion as in standard PCI applications.
Non-transparent bridges allow systems to isolate memory domains by
presenting the processor subsystem as an endpoint, rather than another
memory system. Base address registers are used to translate addresses;
doorbell registers are used to send interrupts between the address domains;
and scratchpad registers are accessible from both address domains to allow
inter-processor communication.
o Reliability, Availability, Serviceability
- Three Standard Hot-Plug Controllers
- Upstream port as hot-plug client
- Transaction Layer end-to-end CRC
- Poison bit
- Advanced Error Reporting
- Lane Status bits and GPO available
- Per port error diagnostics
• Bad DLLPs
• Bad TLPs
• CRC errors
- JTAG boundary scan
- Fatal Error out-of-band signal option
Two Virtual Channels
The ExpressLane PEX 8512 switch supports two Virtual Channels (VCs) and
eight Traffic Classes (TCs). The mapping of Traffic Classes to port-specific
Virtual Channels allows for different mappings for different ports. In
addition, the devices offer user-selectable Virtual Channel arbitration
algorithms to enable users to fine tune the Quality of Service (QoS) required
for a specific application.
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