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Message
From: Matt Ettus<matt@e...>
Date: Wed Apr 25 02:54:55 CEST 2007
Subject: [oc] RMW and Wishbone
My question centers on the definitions of STB_O, CYC_O, and LOCK_O from
the MASTER's perspective.
In a previous discussion, it was said that the INTERCON can interrupt a
MASTER's access to a SLAVE even when CYC_O was held high, thus the need
for the LOCK_O signal to prevent that. If that is true, then I would
assert the following:
In order to perform a true RMW cycle, LOCK_O is needed
However, in Appendix A.4.3, there is no mention of LOCK_O, and it
implies that access to the SLAVE CANNOT be taken away as long as CYC_O
is held asserted.
So, the question is -- without a LOCK_O signal, can a true RMW cycle be
performed?
Matt
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