IBM DTCA-24090 Hard Drive Specifications - Page 107

Check Power Mode, E5h/98h

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12.1 Check Power Mode (E5h/98h) Command Block Output Registers Register 76543210 Data Feature Sector Count Sector Number Cylinder Low Cylinder High Device/Head 1 1D Command 11100101 Command Block Input Registers Register 76543210 Data Error ...See Below... Sector Count V V V V V V V V 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 000 0 V Figure 57. Check Power Mode Command (E5h/98h) The Check Power Mode command will report whether the device is spun up and the media is available for immediate access. Input Parameters From The Device Sector Count The power mode code. The command returns F F h in the Sector Count Register if the spindle motor is at speed and the device is not in Standby or Sleep mode. Otherwise, the Sector Count Register will be set to 0. Command Descriptions 99

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12.1
Check Power Mode
(E5h/98h)
Command Block Output Registers
Command Block Input Registers
Register
76543210
Register
76543210
Data
Data
Feature
Error
...See Below...
Sector Count
Sector Count
VVVVVVVV
Sector Number
Sector Number
Cylinder Low
Cylinder Low
Cylinder High
Cylinder High
Device/Head
1
1D
Device/Head
Command
11100101
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
0
0
0
V
Figure 57. Check Power Mode Command (E5h/98h)
The Check Power Mode command will report whether the device is spun up and the media is available for
immediate access.
Input Parameters From The Device
Sector Count
The power mode code.
The command returns FFh in the Sector Count Register if
the spindle motor is at speed and the device is not in Standby or Sleep mode.
Other-
wise, the Sector Count Register will be set to 0.
Command Descriptions
99