IBM IC25N020ATDA04 Hard Drive Specifications - Page 178

Output Parameters To The Device, Feature

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Output Parameters To The Device Feature Destination code for this command. 02H Enable write cache (See note 2) 03H Set transfer mode based on value in sector count register 05H Enable Advanced Power Management 09H Enable Address Offset mode 44H 40 bytes of ECC apply on Read Long/Write Long commands 55H Disable read look-ahead feature 66H Disable reverting to power on defaults 82H Disable write cache 85H Disable Advanced Power Management (See note 3) 89H Disable Address Offset mode AAH Enable read look-ahead feature BBH 4 bytes of ECC apply on Read Long/Write Long commands CCH Enable reverting to power on defaults Note 1. When the Feature register is 03h ( = Set Transfer mode) the Sector Count Register specifies the transfer mechanism. The upper 5 bits define the type of transfer and the low order 3 bits encode the mode value. PIO Default Transfer Mode 00000 000 PIO Default Transfer Mode, Disable IORDY 00000 001 PIO Flow Control Transfer Mode x 00001 nnn (nnn=000,001,010,011,100) Multiword DMA mode x 00100 nnn (nnn=000,001,010) Ultra DMA mode x 01000 nnn (nnn=000,001,010,011,100, 101) When the Feature register is 05h ( = Enable Advanced Power Management) the Sector Count Register specifies the Advanced Power Management level. C0h-FEh ... 80h-BFh ... 01h-7Fh ... 00h, FFh ... The deepest Power Saving mode is Active Idle The deepest Power Saving mode is Low power Idle The deepest Power Saving mode is Standby Aborted Note 2. If the number of auto reassigned sectors reaches the device's reassignment capacity, the write cache function will be automatically disabled. Although the device still accepts the Set Features command (with Feature register = 02h) without error, the write cache function will remain disabled. For the current write cache function status, refer to the Identify Device Information (129 word) by the Identify Device command. Hard reset or power off must not be done in 5 seconds after write command completion when write cache is enabled. Note 3. When the Feature register is 85h (= Disable Advanced Power Management) the deepest Power Saving mode becomes Active Idle. Travelstar 48GH, 30GN & 15GN hard disk drive specifications 164

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Output Parameters To The Device
Feature
Destination code for this command.
02H
Enable write cache
(See note 2)
03H
Set transfer mode based on value in sector count register
05H
Enable Advanced Power Management
09H
Enable Address Offset mode
44H
40 bytes of ECC apply on Read Long/Write Long commands
55H
Disable read look-ahead feature
66H
Disable reverting to power on defaults
82H
Disable write cache
85H
Disable Advanced Power Management (See note 3)
89H
Disable Address Offset mode
AAH
Enable read look-ahead feature
BBH
4 bytes of ECC apply on Read Long/Write Long commands
CCH
Enable reverting to power on defaults
Note 1. When the Feature register is 03h ( = Set Transfer mode) the Sector Count Register specifies the
transfer mechanism. The upper 5 bits define the type of transfer and the low order 3 bits encode the mode
value.
(nnn=000,001,010,011,100, 101)
nnn
01000
Ultra DMA mode x
(nnn=000,001,010)
nnn
00100
Multiword DMA mode x
(nnn=000,001,010,011,100)
nnn
00001
PIO Flow Control Transfer Mode x
001
00000
PIO Default Transfer Mode,
Disable IORDY
000
00000
PIO Default Transfer Mode
When the Feature register is 05h ( = Enable Advanced Power Management) the Sector Count Register
specifies the Advanced Power Management level.
Aborted
00h, FFh ...
The deepest Power Saving mode is Standby
01h–7Fh ...
The deepest Power Saving mode is Low power Idle
80h–BFh ...
The deepest Power Saving mode is Active Idle
C0h–FEh ...
Note 2. If the number of auto reassigned sectors reaches the device's reassignment capacity, the write
cache function will be automatically disabled. Although the device still accepts the Set Features command
(with Feature register = 02h) without error, the write cache function will remain disabled. For the current
write cache function status, refer to the Identify Device Information (129 word) by the Identify Device
command.
Hard reset or power off must not be done in 5 seconds after write command completion when
write cache is enabled.
Note 3. When the Feature register is 85h (= Disable Advanced Power Management) the deepest Power
Saving mode becomes Active Idle.
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
164