Low Voltage Differential Scsi Port Control - Sun Microsystems storagetek sl500 Reference Manual

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Low Voltage Differential SCSI Port Control Page
The following table shows the format of the SCSI (LVD) Port Control page.
TABLE 6-24 SCSI (LVD) Port Control Page
Byte 7
0 PS (0)
1
2
3
4 (MSB)
to
5
6
7
SCSI (LVD) Port Control Page Definitions:
PS
SPF
Protocol Identifier
Synchronous Transfer
Timeout
110 SL500: Interface Reference Manual • July 2008
6 5
SPF (0)
Page Length (06h)
Reserved
Synchronous Transfer Timeout
The Parameters Saveable bit is set to 0.
The library returns a value of 0 for the SubPage Format bit, indicating page_0
format is being used.
The field is set to 1h indicating the Parallel SCSI protocol.
Indicates the maximum amount of time in 1 ms increments that SCSI target
port shall wait before generating an error by doing an unexpected bus free.
The SCSI target port shall only go to a BUS FREE phase if one of the following
events cause the timer, once started, to not reset or reload before expiring.
If there is a REQ transition when there are no outstanding REQs waiting for
■
an ACK then load and start the timer.
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 then load and start the timer.
If after an ACK transition there are no outstanding REQs waiting for an ACK
■
then stop the timer.
A Synchronous Transfer Timeout field value of 0000h indicates that the
function is disabled. A value of FFFFh indicates an unlimited period.
Bit
4 3 2
Page Code (19h)
Protocol Identifier (1h)
Reserved
Reserved
Reserved
1 0
(LSB)
Revision: F • 96122