Specifications

8.8.11 Mode Page 19 (Port Control)
8.8.11.1 Short Format of Port Control Page
00hReserved7
00hReserved6
00h
|
00h
(MSB)
Synchronous transfer timeout
(LSB)
4
|
5
01hProtocol identifier = 1Reserved3
00hReserved2
06hPage Length = 06h1
99hPage Code = 019hLong=0PS0
01234567
Default
Bit
Byte
Figure 96. Page 19 (Port Control parameters) Short format
The drive maintains an independent set of port control mode page parameters for each SCSI initiator port.
! Protocol identifier has a value of 1h to indicate SPI SCSI devices.
! Synchronous Transfer Timeout indicates the maximum amount that the drive waits before generat-
ing an error by doing an unexpected bus free (see Section 10.3, "Unit Attention" on page 190). The
unit of time is 1 ms. The drive only goes to a BUS FREE phase if one of the following events causes
the timer when started to not reset or reload before expiring.
- If there is a REQ transition when there are no outstanding REQs waiting for an ACK, load and start
the timer.
- If there is a REQ transition when there are any outstanding REQs waiting for an ACK, there is no
effect on the timer.
- If there is an ACK transition when there are outstanding REQs waiting for an ACK, load and start
the timer.
- If after an ACK transition there are no outstanding REQs waiting for an ACK, stop the timer.
A value of 0000h in Synchronous Transfer Timeout indicates that the function is disabled. A value of
FFFFh indicates an unlimited period.
Ultrastar 146Z10 hard disk drive specifications
104