IBM DTCA-24090 Hard Drive Specifications - Page 165

Standby, E2h/96h

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12.31 Standby (E2h/96h) Command Block Output Registers Register 76543210 Data Feature Sector Count V V V V V V V V Sector Number Cylinder Low Cylinder High Device/Head 1 1D Command 11100010 Command Block Input Registers Register 76543210 Data Error ...See Below... Sector Count Sector Number Cylinder Low Cylinder High Device/Head Status ...See Below... Error Register 76543210 CRC UNC 0 IDN 0 ABT T0N AMN 00000V00 Status Register 76543210 BSY RDY DF DSC DRQ COR IDX ERR 0V0V 0 V Figure 101. Standby Command (E2h/96h) The Standby command causes the device to enter the Standby Mode immediately, and set auto power down timeout parameter(standby timer). When this command is issued, the device confirms the completion of the cached write commands before it asserts INTRQ. Then the device is spun down, but the interface remains active. If the device is already spun down, the spin down sequence is not executed. During the Standby mode the device will respond to commands, but there is a delay while waiting for the spindle to reach operating speed. The timer starts counting down when the device returns to Idle mode. Output Parameters To The Device Sector Count Timeout Parameter. If zero, the timeout interval(Standby Timer) is N O T disabled, but the timeout interval is set for 109 minutes automatically. If other than zero, the timeout interval is set for (Timeout Parameter × 5) seconds. When the automatic power down sequence is enabled, The device will enter Standby mode automatically if the timeout interval expires with no device access from the host. The timeout interval will be reinitialized if there is a device access before the timeout interval expires. Command Descriptions 157

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12.31
Standby
(E2h/96h)
Command Block Output Registers
Command Block Input Registers
Register
76543210
Register
76543210
Data
Data
Feature
Error
...See Below...
Sector Count
VVVVVVVV
Sector Count
Sector Number
Sector Number
Cylinder Low
Cylinder Low
Cylinder High
Cylinder High
Device/Head
1
1D
Device/Head
Command
11100010
Status
...See Below...
Error Register
Status Register
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
CRC UNC
0
IDN
0
ABT T0N AMN
BSY RDY DF
DSC DRQ COR IDX ERR
0
0
0
0
0
V
0
0
0
V
0
V
0
V
Figure 101. Standby Command (E2h/96h)
The Standby command causes the device to enter the Standby Mode immediately, and set auto power down
timeout parameter(standby timer).
When this command is issued, the device confirms the completion of the cached write commands before it
asserts INTRQ.
Then the device is spun down, but the interface remains active.
If the device is already spun down, the spin down sequence is not executed.
During the Standby mode the device will respond to commands, but there is a delay while waiting for the
spindle to reach operating speed.
The timer starts counting down when the device returns to Idle mode.
Output Parameters To The Device
Sector Count
Timeout Parameter.
If zero, the timeout interval(Standby Timer) is NOT disabled,
but the timeout interval is set for 109 minutes automatically.
If other than zero, the
timeout interval is set for (Timeout Parameter × 5) seconds.
When the automatic power down sequence is enabled,
The device will enter Standby mode automatically if the timeout interval expires with
no device access from the host.
The timeout interval will be reinitialized if there is a
device access before the timeout interval expires.
Command Descriptions
157