4.14. Page Request Service (PRS) Interface (EP Only)
When an Endpoint determines that it requires access to a page for which the ATS translation is not available, it sends a Page Request message to request that the page be mapped into system memory.
The PRS interface allows the monitoring of when PRS events happen, what functions these PRS events belong to, and what types of events they are.
The PRS interface is only available in EP mode, and with TLP Bypass disabled.
|Signal Name||Direction||Description||Clock Domain||EP/RP/BP|
|prs_event_valid_i||I||This signal qualifies prs_event_func_i and prs_event_i. There is a single-cycle pulse for each PRS event.||coreclkout_hip||EP|
|prs_event_func_i[2:0]||I||The function number for the PRS event.||coreclkout_hip||EP|
00 : Indicate that the function has received a PRG response failure.
01: Indicate that the function has received a response with Unexpected Page Request Group Index.
10: Indicate that the function has completed all previously issued page requests and that it has stopped requests for additional pages. Only valid when the PRS enable bit is clear.
The figure below shows the timing diagram for the PRS event interface when the application layer of function 0 sends an event of PRG response reception, and the application layer of function 1 sends an event stopping requests for additional pages.