IBM IC35L036UWDY10 Hard Drive Specifications - Page 120

Mode Port Control, 8.11.1 Short Format of Port Control

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8.8.11 Mode Page 19 (Port Control) 8.8.11.1 Short Format of Port Control Page Bit Byte 7 6 5 4 3 2 1 0 0 PS Long=0 Page Code = 019h 1 Page Length = 06h 2 Reserved 3 Reserved Protocol identifier = 1 4 (MSB) | 5 Synchronous transfer timeout (LSB) 6 Reserved 7 Reserved Default 99h 06h 00h 01h 00h | 00h 00h 00h 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

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8.8.11 Mode Page 19 (Port Control)
8.8.11.1 Short Format of Port Control Page
00h
Reserved
7
00h
Reserved
6
00h
|
00h
(MSB)
Synchronous transfer timeout
(LSB)
4
|
5
01h
Protocol identifier = 1
Reserved
3
00h
Reserved
2
06h
Page Length = 06h
1
99h
Page Code = 019h
Long=0
PS
0
0
1
2
3
4
5
6
7
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