PCIe Devices - PLX Technology
PCIe Devices - PLX Technology
PCIe Devices - PLX Technology
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Transmit Side of Data Link Layer<br />
n<br />
Two packets types are created and<br />
processed at the Data Link Layer<br />
l<br />
l<br />
Conditioned TLPs<br />
– TLPs received from the<br />
Transaction Layer<br />
• Pre-pended with a 16-bit Sequence<br />
Number<br />
• Appended with a 32-bit Data Link Layer<br />
CRC (LCRC)<br />
Data Link Layer created packets (DLLPs)<br />
– TLP Ack/Nak packets<br />
• Ack/Nak for receive side<br />
– Link management packets<br />
• Link training, initialization, and PM<br />
management<br />
• Flow Control (FC) packets<br />
Transaction Layer<br />
Data Link Layer<br />
Physical Layer<br />
Logical Sub-block<br />
Physical Sub-block<br />
<strong>PCIe</strong><br />
Protocol Stack<br />
Copyright by Dashcourses, Inc. 2009<br />
3-94