BIU Master Request Event 67 P4080

[hymalaibello]

Hello!

I  would like to use the performance counters in the P4080 platform,so In the table of Performance Monitor Event Selection in the page 374 of the  e500mc Core Reference Manual, Rev3. this table has an event "BIU master request" but I do not know  what is "Number of Aout sent to Corenet". What this mean?

Thanks!

Regards,

Hymalai Bello

[ufedor]

Aout is just a reference to the address bus being driven out from core on the core's bus interface.  So Aout would just be a reference that we're starting a bus transaction on the address-out bus. The actual start of the bus transaction there is the assertion of the "transfer start" signal on the Aout bus, so Aout could be called that instead.

[yipingwang · Accepted solution]

Hello Hymalai,

The BIU is the core's interface manager to CoreNet and the rest of the system, the BIU sends and receives transactions from CoreNet and routes them to the appropriate other unites in the core that require them.

"Com:67 BIU master requests" counts all accesses sent out to CoreNet, including memory read, write, Cache triggered read, write, speculative, and instruction and data(load/store) accesses etc.

Have a great day,
Yiping

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