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There is no way (in the standard) for the host can regulate the timing or
manner in which the device pauses. If the device pauses (or stops, in your
case), then the host has to accept that the device has a good reason. Note
that the same is true for the device regulating the behavior of hosts.
Note that this (flow control) is a feature, not a bug.
Jim
-----Original Message-----
From: Stephane Cattaneo [mailto:[EMAIL PROTECTED]]
Sent: Thursday, July 19, 2001 1:39 AM
To: T13
Subject: [temp t13] Device pause in UDMA ...
** This is the quasi-official and semi-temporary T13 email list server. **
Dear all,
I am trying to make some UDMA transfer and when I try to make a writing
transfer of more than 1 sector (2 sectors
for example), using the DMA write command 0xCA, I have a device pause at
the end of the first sector (DMARQ not asserted), and I would like to
know why the device makes a pause. I am in UDMA mode 0, and I found only
one hdd, brand name Maxtor (31536H2, 5400 rpm), which accepts for
example a transfer of 20 sectors without saying someting (it starts
crying after a request of more of 70 sectors). All the seagate ones I
have makes a device pause directly after the first sector transfered.
Have you any idea of the device behaviour ?
Why does the device make some pause ? Why is it different, depending of
the brand name ?
Is there a way to avoid device pause ?
Thanks a lot for your help.
Stephane.
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