Hitachi IC35L060AVV207 Datasheet Page 190

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85H Disable Advanced Power Management
86H Disable Power-up in Standby mode
89H Disable Address Offset mode
AAH Enable read look-ahead feature
BBH 4 bytes of ECC apply on Read Long/Write Long commands
C2H Disable Automatic Acoustic Management
CCH Enable reverting to power on defaults
DDH Disable release interrupt
Note: After a power on reset of hard reset the device is set to the following features as default:
Write cache : Enable
ECC bytes : 4 bytes
Read look-ahead : Enable
Reverting to power on defaults : Disable
Release interrupt : Disable
11.37.1 Set Transfer mode
When Feature register is 03h (= Set Transfer mode), the Sector Count Register specifies the transfer
mechanism. The upper 5 bits defines the type of transfer and the low order 3 bits encodes 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)
11.37.2 Write Cache
If the number of auto reassigned sectors reaches the reassignment capacity of the device, the write
cache function will automatically be disabled. Although the device still accepts the Set Features com-
mand with Feature register = 02h without error, the write cache function remains disabled. For current
write cache function status refer to Figure 101 "Identify Device Information" (word 85 or 129) on page
121.
11.37.3 Advanced Power Management
When the value in the Feature register is 05h (= Enable Advanced Power Management), the Sector
Count Register specifies the Advanced Power Management level.
Aborted00H
The lowest power consumption mode is Low RPM standby mode01 - 7Fh
The lowest power consumption mode is Low power Idle mode80 - BFh
The deepest Power Saving mode is Normal Idle mode (the same as Disable
Advanced Power Management
C0 - FEh
AbortedFFH
Deskstar 180GXP hard disk drive specifications
176
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