Re: Question on DAC

["Weng" <wtx@umem.com>]

Hi,
You are right.

DAC Bars are only needed when your board has memory to be accessed by others
beyond 32-bit space.

It has nothing to do with whether or not you are generating DAC as Master.

Weng Tianxiang

wtx@umem.com
wengtianxiang@yahoo.com

Micro Memory Inc.
9540 Vassar Avenue
Chartsworth, CA 91311
Tel: 818-998-0070
Fax: 818-998-4459
----- Original Message -----
From: James Murray <jmurray@triscend.com>
To: PCI SIG <pci-sig@znyx.com>
Sent: Friday, May 04, 2001 11:18 AM
Subject: Question on DAC


> Hello
>
> I have a basic question on DAC.
>
> I want to be able to initiate DAC cycles over the PCI bus. I do not want
> to support being a target of 64-bit cycles (DAC or otherwise). I assume
> that I do NOT need to implement a DAC BAR to be able to achieve this
> aim. i.e. the DAC BAR indicates support for DAC target transactions and
> does not affect my DAC mastering capability. Are these assumptions
> correct?
>
> Thanks in advance
>
> James
>
>