** This is the quasi-official and semi-temporary T13 email list server. **
Ed,
The "clock" for the CRC is DMACK- which always flows from the host to the
device. If the CRC always flows from the host to the device, then the clock
and the information it references are flowing the same direction.
It is just good design.
Hugh Curley
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, September 05, 2001 14:23
Subject: [temp t13] Ultra DMA CRC Clarification
> ** This is the quasi-official and semi-temporary T13 email list server.
**
>
> In section 6.6.1 of T13 1410D Revision 1b, the following sentence is
> mentioned.
>
> "At the end of an Ultra DMA burst the host sends its CRC data to the
> device. The device compares its CRC data to the data sent from the host.
> If the two values do not match, the device reports an error in the error
> register. ...."
>
> There appears to be many articles indicating that the CRC word is sent
with
> the data, and the receiving end is the one performing the CRC check.
>
> Does the above statements specified in the specifications indicate that
> only the device shall receive the CRC data and perform the CRC check no
> matter what the data direction is (i.e. whether it is an ultra DMA read or
> ultra DMA write)? This implies that for any CRC information sent over the
> bus originates from the host?
>
>
> Thanks
> Ed
>
>
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