RE: compliance checklist question

["Weng Tianxiang" <WTX@umem.com>]

Hi Toshi,
Don't be confused with the test case.

The data hand-shaking conditions for PCI transaction is very simple:
During a transaction, when both TRDY# and IRDY# are asserted, data is
transferred.

The test case is to describe a situation to see if your design works for
the special situation.

Weng


-----Original Message-----
From: Toshi Isogai [mailto:tisogai@seakr.com] 
Sent: Tuesday, September 24, 2002 10:29 AM
To: pci-sig@znyx.com
Subject: compliance checklist question



Hello All,

Alan Deikman suggested me to send this e-mail to pci-sig instead of
pci-com for more response. Please execuse me if you have seen this
e-mail already in pci-com list.

******


Then, Item 2 would mean

 clk 1:  TRDY#  asserted 
 clk 2:   TRDY# deasserted ( aka released ),  wait state.
 clk 3:  TRDY# asserted

This initial TRDY assertion is not allowed for read operation because
the cycle is a turn-around cycle, is it?



On Tue, 24 Sep 2002 11:08:03 -0500
David Duxstad <dux@ieee.org> wrote:

> Toshi:
>   This is a multi-data phase transaction.  So this it would be 
> something
> like:
> 
> clk 2:  TRDY#  asserted
> clk 3:   TRDY# deasserted ( aka released ),  wait state.
> clk 4:  TRDY# asserted
> Toshi Isogai wrote:
> 
> > Hello,
> >
> > I am having a hard time to understand one of scenario in the 
> > checklist. For Master device, Test Scenario 1.8 Multi-Data Phase & 
> > TRDY# Cycles Item 3 states:
> >
> >   "Verify that data is written to primary target when TRDY# is
released
> >   after 3rd rising clock edge and asserted on 4th rising clock edge
after
> >   FRAME#"
> >
> > Does this mean the target is not driving TRDY until 3rd edge? If so,

> > what is this test trying to verify? Pulled-up high or driven high 
> > does not make any functional difference for the receiving master 
> > device. I have read Addendum A for description but I still don't 
> > have any idea. Can anybody advise me on this?
> >
> > Thanks.
> >
>
-- 
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Toshi Isogai          tisogai@seakr.com

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