Re: Latency timer questions

["Peter Marek" <peter.marek@marekmicro.de>]

Comments: see below.

Peter Marek
General Director
MarekMicro GmbH
Kropfersrichter Str. 6-8
D-92237 Sulzbach-Rosenberg
Germany
Phone: 049 - 9661 - 908 - 210
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----- Original Message -----
From: Vijay Chougule <vchougule@yahoo.com>
To: <pci-sig@znyx.com>
Sent: Friday, September 08, 2000 3:04 AM
Subject: Latency timer questions


> Hello everyone,
>
> I am doing a PCI master card. I have couple of
> questions about the latency timer and ownership of the
> bus.
>
> 1. If the gnt# is still asserted at the time at which
> the Latency timer expires, can I continue doing the
> burst until the gnt# signal is deasserted ?

You can do so.

>
> 2. In the real life systems (pentium class or other
> workstations), what happens if I deassert the req#
> signal immediately after gnt# is asserted for me ?
> Will the arbiter in the system deassert the gnt#
> signal and park the bus to some other agent (if at all
> parking is implemented) ? Is there any disadvantage of
> deasserting the req# signal signal immediately after
> getting the gnt# signal even if I want to do a long
> burst ?

Usually the arbiter will grant the bus to another device if there's such a
request. Tha arbiter will ususally do the same if you keep req asserted.

>
> Thank you in advance.
>
> Vijay
>
>
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