Hitachi 7K320 Specifications - Page 135
Set Features EFh
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7K320 (SATA) OEM Specification 14.35 Set Features (EFh) Command Block Output Registers Register 76543210 Data -------- Feature VVVVVVVV Sector Count Note.1 LBA Low -------- LBA Mid -------- LBA High -------- Device -------- Command 11101111 Command Block Input Registers Register 76543210 Data -------- Error ...See Below... Sector Count -------- LBA Low -------- LBA Mid -------- LBA High -------- Device -------- Status ...See Below... Error Register 7 6 5 4 3 2 1 0 CRC UNC 0 IDN 0 ABT T0N AM N 000 0 0V0 0 Table 106 Set Features Command (EFh) Status Register 7 6 5 4 3 2 1 0 BSY RDY DF DSC DRQ COR IDX ERR 0V0 - - 0 0V The Set Feature command is to establish the following parameters which affect the execution of certain features as shown in below table. ABT will be set to 1 in the Error Register if the Feature register contains any undefined values. After power on reset, the device is set to the following features as default. Write cache ECC bytes Read look-ahead Reverting to power on defaults Device-initiated interface power state transition Software setting preservation : Enable : 4 bytes : Enable : Disable : Disable : Enable Output Parameters To The Device Feature Destination code for this command 02H Enable write cache (Note.2) 03H Set transfer mode based on value in sector count register 05H Enable Advanced Power Management 06H Enable Power-Up in Standby feature set 07H Power-Up in Standby feature set device spin-up 10H Enable use of Serial ATA feature 41H Enable Free-fall Control feature set (Note 5) 55H Disable read look-ahead feature 66H Disable reverting to power on defaults 82H Disable write cache 85H Disable Advanced Power Management (Note.3) 86H Disable Power-UP in Standby feature set 90H Disable use of Serial ATA feature AAH Enable read look-ahead feature C1H Disable Free-fall Control feature set (Note 5) CCH Enable reverting to power on defaults Page 135 of 176