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PERR# and SERR#
Why are some signals in PCI like TRDY#, IRDY#, FRAME# etc categorised as
Sustained tristate signals? What makes them different?
Why is PERR# a STS (sustained tristate signal) signal, while SERR# an
Does the above difference arise due to the fact that
1) PERR# has always a transaction cycle associated with it and SERR#
is only partially (for address parity errors and data parity errors
special cycle command and for system errors) and
2) SERR# can be asserted by more than one agent at any time while PERR#
can be asserted by only one agent (involved in the current
Thanks in advance.