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PCIe Devices - PLX Technology

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Normal Operations<br />

n<br />

Once the Link is initialized and operational, the<br />

Data Link Layer conditions TLPs received from<br />

the Transport Layer and passes them to the<br />

Physical Layer<br />

l Data Link Layer service DLLPs will show up as traffic<br />

intermittently<br />

– Exchange of flow control credits, Ack/Nak,<br />

power transition commands<br />

n<br />

Data Link Layer TLP conditioning consists of<br />

l<br />

l<br />

Pre-pending a Sequence Number to the TLP and<br />

appending a 32-bit link layer CRC (LCRC)<br />

Validating received LCRCs, acknowledgement, and passing<br />

TLP to Transaction Layer on the receiver side<br />

Copyright by Dashcourses, Inc. 2009<br />

3-115

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