Delayed Transactions-Role in Target

[bhanupratap bandaluppi <bhanupratap_b@yahoo.com>]

Hi all,
       We are currently designing PCI Core. I am
having some
clarifications regarding delayed transactions:
1. When will delayed transactions occur generally?
Suppose if our PCI
Core is only Target core, will only single delayed
transactions occur
or is it possible to design our core such that it can
handle multiple
delayed transactions?
2. Delayed transactions - suppose if we have PCI
Target core, what
role should it play in delayed transactions?
3. Suppose if we are implementing delayed
transactions, and target
issued retry, in that case if master hasnt responded
with same
transaction or other masters wants to access the
target with different
transactions - I think without latching the data and
address, target
needs to give retry. In that case, i think some of the
clock cycles
will be wasted until the delayed transaction is
completed? what will
be the advantage of this delayed transactions?
4. Do we need to keep a prefetched buffer memory in
our core for
delayed transactions?
Please reply soon,
Thanks
Naveen

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