IM21

The dual ready protocol of the standard is borrowed from PCI and other
similar systems. Here are some clarifications. All of these boil
down to the idea that once an entity indicates that it is ready, it
cannot "change its mind" or abort the cycle. It must hold itself ready
until the data moves.

Point #1: The transmitter cannot "change its mind" or abort
the cycle.

Point #2: The receiver cannot "change its mind" about its
readiness or abort the cycle.

Point #3: Yes, this is a correct understanding. When
transmit ready is active, the data is good.

Point #4: The sender must hold the message CONSTANT otherwise
there could be a race between the data change and the receive ready.

Duaine
Received on Wed Mar 24 12:07:35 2004