DT mode

Wolfgang Michel wolfgang_michel at vortex.de
Fri Mar 17 09:02:05 PST 2000

* From the T10 Reflector (t10 at t10.org), posted by:
* "Wolfgang Michel" <wolfgang_michel at vortex.de>

SPI3 is not very clear about the relationship between DT 
mode and the transfer rate. So my question is: Are there any 
restrictions using DT mode (DT_REQ=1) together with any values of the 
Transfer Period Factor. I have observed that several drives accept 
PPR messages with DT_REQ=1 only if the transfer period factor is 
set to Fast-80, i.e. 0x9. If DT with slower transfer rates is 
allowed, when should then change the data/parity lines (in the 
middle of the strobe, or after the minimum hold time for the falling 
edge, or???).

Thanks for the assitance.


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 vortex.de
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