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Original packaging PEX8518-AC25BI LP Flexible & Versatile PCI Express® Switch Chip

PEX8518-AC25BI LP

Model:PEX8518-AC25BI LP

Manufacturer:PLX

Package:BGA

Detail

Product Descriptions


Multi-purpose, Feature Rich ExpressLane™ PCI Express Switch  


The ExpressLane PEX 8518 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 8518 is well suited for fan-out, aggregation, peer-to peer, and intelligent I/O module applications.  


Highly Flexible Port Configurations  


The PEX 8518 offers highly configurable ports. There are a maximum of five  ports that can be configured to any legal width from x1 to x8, in any  combination to support your specific bandwidth needs. The ports can be  configured for symmetric (each port having the same lane width and traffic  load) or asymmetric (ports having different lane widths) traffic. In the event  of asymmetric traffic, the PEX 8518 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 (are asymmetric). Any of  the ports can be designated as the upstream port, which can be changed  dynamically.


End-to-end Packet Integrity  


The PEX 8518 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 8518 supports full non-transparent bridging (NTB) functionality to  allow implementation of multi-host systems and intelligent I/O modules in  applications such as communicationsstorage, 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.  


Two Virtual Channels  


The ExpressLane PEX 8518 switch supports two full-featured 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.

Product Features


ƒ PEX 8518 General Features  

16-lane PCI Express switch  Integrated SerDes  

Up to five configurable ports  

23mm x 23mm, 376-ball PBGA  package  

Typical Power: 2.6 Watts  

ƒ PEX 8518 Key Features  

Standards Compliant  

PCI Express Base Specification, r1.1  

Standard SHPC Specification, r1.1  (hot-plug)  

High Performance  

Non-blocking internal architecture  

Full line rate on all ports  

Cut-Thru latency: 150ns  

Non-Transparent Bridging  

Configurable Non-Transparent port  for Multi-Host or Intelligent I/O  Support  

Flexible Configuration  

Five highly flexible & configurable  ports (x1, x2, x4, or x8)  

Configurable with strapping pins,  EEPROM, IC, or Host software  

Lane and polarity reversal  

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  

Spread Spectrum Clock  

Dual clock domain  

Quality of Service (QoS)  

Two Virtual Channels per port  

Eight Traffic Classes per port  

Fixed and Round-Robin Virtual  Channel Port Arbitration  

Reliability, Availability, Serviceability 

5 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


Product Applications


Suitable for host-centric as well as intelligent I/O  

applications ExpressLane PEX 8518 can be configured for a  wide variety of form factors and applications.


Actual product photos


PEX8518-AC25BI LP


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Standard packaging


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