** This is the quasi-official and semi-temporary T13 email list server. **
100% agreement with Larry (we have no interest in execute diagnostics
either).
An additional reason we don't like BSY=0, DRDY=0 is it
can be confused (or difficult to distinguish) with a ATAPI
device (where BSY=0, DRDY=0 is a normal, no media status)
For ATA devices we still have to wait for the DRDY=1 status
before we can issue the command we REALLY want (Identify Device)
Jeff
Jeff Wolford Email: [EMAIL PROTECTED]
Senior Storage Architect
Manager - Storage Interface and Tools - PC Storage Group
Voice: (281) 514-9465, Pager: (800) 973-5739
Compaq Computer Corporation
> -----Original Message-----
> From: Larry Barras [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, July 12, 2001 8:17 PM
> To: [EMAIL PROTECTED]
> Subject: [temp t13] Re: Are devices allowed to go busy on their own?
>
>
> ** This is the quasi-official and semi-temporary T13 email
> list server. **
>
> Curtis,
>
> I tend to favor the drive behavior of BSY=1 while DRDY=0, in other
> words, not clearing BSY until the device is ready.
>
> Execute device diagnostics doesn't seem to serve any useful purpose
> that I can see. It doesn't help with enumerating what's on the bus
> anyway.
>
>
>
> >Jim
> >
> > There are 2 behaviors that are common during spin-up.
> The one I
> >support strongly is the BSY=0, DRDY=0. This lets you issue EXECUTE
> >DIAGNOSTICS immediatly. Unfortunatly, some drives appear to hang...
> >The other is BSY=1, DRDY=x. This prevents anything from happening
> >during spin-up. Unfortunatly, if the pull-down is missing on DB7,
> >this can cause the system to think that the channel is empty. I
> >believe that the current specification ellows for both
> >implementations.
> --
>
> ---------------------
> "Anything you CAN control you MUST control."
> Wendy Carlos
> ---------------------
>
> Larry Barras
> Apple Computer Inc.
> 1 Infinite Loop
> MS: 306-2TC
> Cupertino, CA 95014
> (408) 974-3220
> --
> If you have any questions or wish to unsubscribe send a
> message to Hale Landis, [EMAIL PROTECTED] To post to
> this list server send your message to [EMAIL PROTECTED]
>
> For questions concerning Thistle Grove Industries or TGI's
> list services please send email to [EMAIL PROTECTED]
>
>
>
--
If you have any questions or wish to unsubscribe send a
message to Hale Landis, [EMAIL PROTECTED] To post to
this list server send your message to [EMAIL PROTECTED]
For questions concerning Thistle Grove Industries or TGI's
list services please send email to [EMAIL PROTECTED]
