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Re: Experience about the setting of MIN_GNT and MAX_LAT?
- To: Mailing List Recipients <pci-sig-request@znyx.com>
- Subject: Re: Experience about the setting of MIN_GNT and MAX_LAT?
- From: brians@Aureal.com (Brian Sassone)
- Date: Mon, 2 Feb 1998 08:17:17 -0800 (PST)
- Cc: pcisig@Aureal.com
- In-Reply-To: <95A15ED73E8@WERNER.MSC-GE.COM> from "Uwe Huebner" at Feb 2, 98 09:10:49 am
- Resent-Date: Mon, 2 Feb 1998 08:41:07 -0800
- Resent-From: pci-sig-request@znyx.com
- Resent-Message-ID: <"pT111.0.je3.M6Vrq"@electra.znyx.com>
- Resent-Sender: pci-sig-request@znyx.com
- Sender: brians@Aureal.com
These values should be used to program the value of your latency timer and
could also be used to determine an arbitration priority. It seems,
however, that many systems don't really care what these values are. This
may be due to their ambiguous treatment in the current spec.
Neither the meaining nor the intended use of these registers is made at all
clear. What target latency is assumed? Initial v. subsequent? When
specifying MAX_LAT, do you assume that you are getting the grant time
specified my MIN_GNT? How the system interprets these values and what it
does with them seems to be left wide open.
Anybody have any further experience or insights in this area?
Brian
>
> Has anybody made any experience about the (pre-) setting of
> MIN_GNT and MAX_LAT in the PCI configuration space?
> Whereas the meaning of these registers is
> specified its use seems not to be specified.
>
> Any idea?
>
> Uwe
> __
> E-Mail: uh@msc-ge.com
> Uwe Huebner
> MSC
> Industriestr. 16
> D-76297 Stutensee
> Germany
>
>