Hitachi IC25N040ATCS04-0 Specifications - Page 173

Output parameters to the device Feature Destination code for this command. 02H 03H 05H 09H 44H 55H 66H 82H 85H 89H AAH BBH CCH Enable write cache (See note 2) Set transfer mode based on value in sector count register Enable Advanced Power Management Enable Address Offset mode 40 bytes of ECC apply on Read Long/Write Long commands Disable read look-ahead feature Disable reverting to power on defaults Disable write cache Disable Advanced Power Management (See note 3) Disable Address Offset mode Enable read look-ahead feature 4 bytes of ECC apply on Read Long/Write Long commands 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 00001 (nnn=000,001,010,011,100) Multiword DMA mode x 00100 nnn 00100 nnn (nnn=000,001,010) Ultra DMA mode x 01000 nnn 01000 nnn (nnn=000,001,010,011,100) 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 during the first 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. Hitachi Travelstar 60GH & 40GN hard disk drive specifications 160