Number of pad bytes with DT transfers

Wolfgang Michel wolfgang_michel at
Tue Mar 7 02:26:29 PST 2000

* From the T10 Reflector (t10 at, posted by:
* "Wolfgang Michel" <wolfgang_michel at>

Given a sequential device (like a DAT, etc.) is transfering data to 
the initiator with DT data group transfers. And further given the 
device has to disconnect from the initiator due to an internal 
resource condition on a non module 4 boundary. The device than has to 
fill up the last data field up to the next 4 byte boundary with 
padding bytes before sending the CRC. How is the initiator able to 
identify the number of pad bytes (1,2 or 3)? Up to my understanding 
the IGNORE WIDE RESIDUE message "invalidates" only 1 byte.

Your assistance/help is really appreciated.


Wolfgang Michel, Director R&D
ICP vortex Computersysteme GmbH
Konrad Zuse Str. 9
74172 Neckarsulm, Germany
Tel.: +49-7132-9620-535
Fax : +49-7132-9620-200
email: w_michel at

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