Fast-20 Timing Definition
Gene at notes.seagate.com
Gene at notes.seagate.com
Fri Jan 6 06:52:30 PST 1995
I am not sure that Tak Asami's conclusions are correct that the examples he
showed are allowed by any implementations of SCSI. But his conclusion is
correct with layered standards if Fast 20 were combined with some non SCSI-3
layered standards. (Mix and Match.) In any case I have no objection to his
intent. But,
Tak Asami wrote:
"
Table 1: SCSI bus timing values
____________________________________________________________________________
| Timing description | fast-20 fast slow asynch |
|------------------------------------------+-------------------------------|
| Transfer Period during | |
| Synchronous Data Transfer Phases (note 5)| 50nsec 100nsec 200nsec n/a |
|__________________________________________|_______________________________|
Notes -
5) The transfer period is measured from an assertion edge of REQ (ACK)
signal to the next assertion edge of the signal."
The proposal needs to be changed to indicate that these are minimum values and
larger values are allowed.
Gene
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