Hitachi C4K60 Specifications - Page 97

7.5.35. Set Features [EFh] Task File Registers Command LBA High LBA Mid LBA Low Device/Head Sector Count Features 7 6 5 4 3 2 1 0 EFh XX XX XX X X X DRV X X X X Refer to Table 7.25 Refer to Table 7.25 This command is used to specify the parameters shown in Table 7.25 and Table 7.26. Table 7.25 Set feature Register Definition Features Code *1 Description 03h Set transfer mode based on value in Sector Count register See Table 7.26. 05h Enable Advanced Power management *2 09h Enable Address Offset Mode *3 33h Disable retries 44h Enable Vendor Unique ECC Byte Length(24 bytes) transfer 55h Disable read look-ahead feature 66h Disable reverting to power on defaults 77h Disable ECC 85h Disable Advanced Power management *2 88h Enable ECC 89h Disable Address Offset Mode *3 99h Enable retries AAh Enable read look-ahead feature BBh Enable 4 bytes ECC transfer CCh Enable reverting to power on defaults 02h Enable write cache 82h Disable write cache *1: If the code is not supported, the device returns Aborted Command Error. *2: See Sec. 7.2.2.3 Advanced Power Management for the details. *3: See Sec. 7.2.6 Address Offset Feature (Vendor Specific)for the details. Default √ √ Table 7.26 Transfer Mode Code Definition Sector Count Register 2Xh 4Xh Transfer Mode Multi-Word DMA Mode (X: 0, 1, 2): 0: Mode 0(4.1 MB/s), 1: Mode 1(13.3 MB/s), 2: Mode 2(16.6 MB/s) Ultra DMA Mode (X: 0, 1, 2, 3, 4, 5): 0: Mode 0(16.6 MB/s), 1: Mode 1(25.0 MB/s), 2: Mode 2(33.3 MB/s) 3: Mode 3(44.4 MB/s), 4: Mode 4(66.6 MB/s), 5: Mode 5(100.0 MB/s) K6610170 Rev.2 Dec 22, 2004 - 97 -