Mode Select (6)
110 SL500: Interface Reference Manual • July 2008 Revision: F • 96122
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
Bit
76543210
0 PS (0) SPF (0) Page Code (19h)
1 Page Length (06h)
2 Reserved Protocol Identifier (1h)
3 Reserved
4
to
5
(MSB)
Synchronous Transfer Timeout
(LSB)
6 Reserved
7 Reserved
SCSI (LVD) Port Control Page Definitions:
PS The Parameters Saveable bit is set to 0.
SPF The library returns a value of 0 for the SubPage Format bit, indicating page_0
format is being used.
Protocol Identifier The field is set to 1h indicating the Parallel SCSI protocol.
Synchronous Transfer
Timeout
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.
To Next Page
Loading...
Need help?
General
