Hi ,
I have got a basic doubt in PCI arbiter regarding the GRANT signal of the PCI arbiter. When exactly should the PCI arbiter remove the GRANT signal of a particular device , is it totally dependent on the REQ signal of that particular device or does it also depend on FRAME and IRDY.
Thanks in advance .
Regards, Praveen
GNT# can be deasserted by the arbiter at any time (no need for REQ# to be deasserted). The current transaction is allowed to continue according to latency timer rules and the new master takes control after the current master idles the bus (deasserts FRAME# and IRDY#).
As I understand it from my PCI System Architecture (4th edition), the arbiter should remove GRANT when REQ is deasserted. There is no dependence on FRAME or IRDY.
--DF
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