Re: I need some consultancy from someone with ATAPI design expertise

From: Calin Dorohoi (calin_dorohoi_at_yahoo.com)
Date: 11/02/04 

Date: 2 Nov 2004 01:14:29 -0800

toby@telegraphics.com.au (Toby Thain) wrote in message news:<d6ce4a6c.0411011048.185e4dbb@posting.google.com>...
> seems to me
> you'd need a much faster MCU, or external RAM & DMA to handle realtime
> concurrent I/O and processing at 8X. (Doesn't matter for my
> application, which is non-realtime, PIO, and synchronous.)
>
> --Toby

I don't like the idea of using DMA. I'd rather use a fast MCU. I'll
only need to read data at 1x, since the CD's will only be played back.
But if it's true that newer CD-ROM's can't read CD's at speeds below
8X...

Relevant Pages

  • [git patches] IDE updates
    ... enable DMA for all ATAPI devices ... it821x: PIO mode setup fixes ... * for a drive into the cmd646 chipset registers to active them. ... + * This routine selects drive's best PIO mode and writes into the chipset ...
    (Linux-Kernel)
  • Re: Dma mode has reverted to Pio mode..Please Help...:o)
    ... >I have googled the prob and found that the prob is Dma mode has reverted to ... I had an Asus K7M board, I had The Plextor 12/10/32a as primary on the ... so the Plextor wasDMA and the CD was PIO. ... I DO know that once Windows XP decides that the Plextor is only PIO ...
    (microsoft.public.windowsxp.general)
  • Re: Dma mode has reverted to Pio mode..Please Help...:o)
    ... >>I have googled the prob and found that the prob is Dma mode has reverted ... > I had an Asus K7M board, I had The Plextor 12/10/32a as primary on the ... so the Plextor wasDMA and the CD was PIO. ... > I DO know that once Windows XP decides that the Plextor is only PIO ...
    (microsoft.public.windowsxp.general)
  • Re: Dma mode has reverted to Pio mode..Please Help...:o)
    ... Many thanks for your Reply Nigel ive been through this workaround before i ... > enable DMA mode. ... so the Plextor wasDMA and the CD was PIO. ...
    (microsoft.public.windowsxp.general)
  • Re: 32M ATA Read command
    ... Have you talked with any HBA vendors or driver suppliers, ... And that's just the nature of PIO. ... Intermingled DMA and PIO is fine. ... It's just a SCSI bus filter, sitting on top of the pseudo-SCSI ATA port ...
    (microsoft.public.win32.programmer.kernel)