Bus Device Reset Other port
Jeff Williams
jlw at hpbs1506.boi.hp.com
Fri Dec 2 08:30:04 PST 1994
> Tom Wickland's original message asked whether the target should
> (A) Go bus free, or
> (B) Continue processing the command.
>
> The original intent was to do (B). This should be imputed from the SIP
> description because messages like BUS DEVICE RESET or ABORT that are supposed
> to go to bus free have clear statements that the drive shall go to bus free.
> Since this action is not mandated, the target is expected to continue with
> normal processing after doing the message function.
>
> It was anticipated that the initiator may send the BUS DEVICE RESET message
> after the BUS DEVICE RESET OTHER PORT message in many situations, which will
> effectively reset everything. It seems possible to continue processing the
> current command in the case of a partial reset, however, so this should not be
> excluded.
I would prefer to see a BUS FREE. What option does an initiator have
when it wishes to ONLY reset the other port? Outbound disconnect? Abort
Tag? There aren't many choices. A BUS FREE gives the most flexibility
and is simple to implement. Anything other than this is added complexity.
Regards,
Jeff
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Jeffrey L. Williams HP TelNet: 396-5030
Disk Controllers Lab Telephone: (1) (208) 396-5030
Disk Memory Division Facsimile: (1) (208) 396-6858
Hewlett-Packard Co. ARPANET: jlw at hpdmd48.boi.hp.com
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