RE: [pci] SOS: about turnaround cycle

["Tadej Markovic" <tadejm@flextronics.si>]

Hi

I would warmly recommend you to change that, but as you wrote, you don't
have much time.
So, to understand you better:

 - turn-around cycles are there, but instead of "no bus driver" your chip
still drives bus for one more cycle
 OR
 - turn-around cycles are there, but instead of "no bus driver" your chip
starts driving bus with "idle" signals
 OR
 - turn-around cycles are left out, what means that your chip starts driving
bus one cycle too soon (every PCI compatible device expects turn-around
cycle at this time - what about your device?)

Well in the last case, if your chip expects active signals that soon, then
"PCI" bus with your chips will work, they just might not live that long due
to possible bus contentions.

I hope this helps.

Regards,
	Tadej



-----Original Message-----
From: owner-pci@opencores.org [mailto:owner-pci@opencores.org]On Behalf Of
wuyunsheng
Sent: 20. marec 2003 7:38
To: pci@opencores.org
Subject: [pci] SOS: about turnaround cycle


hi all,

my design containing a pci core(i design it myself) will be taped out soon.
but just now i found out that in some circumstances there are no turn around
cycles on AD and CBE signals when the bus driver changes. since it is on
schedule to tape out, i am anxious to know whether i must modify rtl code to
fix it.

any advices are deeply appreciated.

best regards.

sumnow

--
To unsubscribe from pci mailing list please visit
http://www.opencores.org/mailinglists.shtml


--
To unsubscribe from pci mailing list please visit http://www.opencores.org/mailinglists.shtml