** This is the quasi-official and semi-temporary T13 email list server. **
Shibu,
Re: DRDY ATAPI bit
I too would like to know what the DRDY bit can be
used for on ATAPI devices
Re: PIO Mode
a) The host is in complete (almost) control of the PIO timing
(IORDY could stretch it out), so the drive has no idea
what mode the host is actually using (just an fastest upper bound).
The only way that I think the drive could know this
info is if the host wrote it to the drive.
b) For PC storage PIO is not used (except for boot):
i) Significant HDD performance impact
ii) When using Intel Pentium II or later processors, it is
very difficult to support faster than 16X CD-ROM drives
let alone 48/52X CD, or 16X DVD drives
iii) DAE (digital audio extraction) even at 1X is very difficult in
PIO
Therefore I am for NOT making any changes for PIO
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: SHIBU BABY [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, May 23, 2001 2:02 AM
> To: '[EMAIL PROTECTED]'
> Subject: [temp t13] Device Reset
>
>
> ** This is the quasi-official and semi-temporary T13 email
> list server. **
>
> hi
> As per ATA/ATAPI-4 Sec 9.4 ,after a Device Reset command the"
> device Shall
> not set the DRDY bit" Why this. Due to this we can't send
> other commands to
> the device because DRDY=0. I know ATAPI device has littlie meaning on
> DRDY.But DRDY =1 is a prerequisite for most commands.
>
> I have also one suggestion. Now there is no method to read
> the currently
> operating PIO mode of ATA device. I think we can read this
> information form
> the ATA host controller. What about adding this information
> to IDENTIFY DATA
> or any other commands. Reading this information from host
> controller will
> depends on the implementation of the controller.
>
> Thanks in advance
> Shibu
>
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