SCSI Description
5-60 Maxtor Atlas 10K III
The port control mode page (see T able 5-76 and T able 5-77) contains those parameters
that aff ect SPI SCSI de vice port operat ion opti ons. The page will be implement ed by
LUN 0 of all SPI SCSI device s. The page will not be implemented by logical units
other than LUN 0. The implementation of any bit and its associated functions is
optional. The page follows the MODE SENSE/MODE SELECT rules specified b y
SCSI Pri mary Commands-2 sta n dard .
The target will maint ain an ind ependent set of port contr ol mode page parameters for
each initiator. The pa rameters saveable bit in the mode page format header returned
with MODE SENSE command will be set to zero if the long mode page format is
being used (LONG bit set to one), indicating the parameters are not saved through
resets.
Port Control Page Short Format
The Protocol Identifier field of 1h indicates the protocol that this mode page applies
to a SPI SCSI device. See the SCSI Primary Commands-2 standard for other port
control page protocol identifiers.
The Synchronous Transfer Timeout field indicates the maximum amount of time in
1 millisecond increments that the target will wait before generating an error by doing
an unexpected bus free. The target will only go to a BUS FREE phase if one of the
following events causes the timer, once started, to not reset or reload before expiring:
•If there is a REQ transition when there are no outstanding REQs
wait ing for an AC K then load and start the tim er.
•If there is a REQ transition when there are any outstanding REQs
waiting for an ACK then there is no effect on the timer.
•If there is an ACK transition when there are outstanding REQs waiting
for an ACK the n load and start the time r.
•If after an AC K tran sitio n there are no outstand in g RE Q s waiting for
an ACK th e n s top the ti m er.
•A SYNCHRONOUS TRANSFER TIMEOUT field value of 0000h
indicates that the function is disabled. A value of FFFFh indicates an
unlimited period.
0 PS LONG(0) Page Code (19h)
1 Page Length (06h)
2 Reserved
3 Rese rved Pro tocol Identifier (1h)
4 MSB Synchronous Transfer Timeout
5 Sy nchronous Transfer Timeout LSB
6 Reserved
7 Reserved