Hitachi C4K60 Specifications - Page 76

7.5.16. Read DMA EXT [25h] Task File Register 7 6 5 4 3 2 1 0 Command 25h Feature Previous setting XX Current setting XX LBA High Previous setting LBA bit 47 - 40 Current setting LBA bit 23 - 16 LBA Mid Previous setting LBA bit 39 - 32 Current setting LBA bit 15 - 8 LBA Low Previous setting LBA bit 31 - 24 Current setting LBA bit 7 - 0 Sector Count Previous setting Sector Count bit 15 - 8 Current setting Sector Count bit 7 - 0 Device X 1 X DEV X X X X This command executes in a similar manner to the READ SECTORS EXT command except for the following: - The host initializes a slave-DMA channel prior to issuing the command. - Data transfers are qualified by DMARQ and are performed by the slave-DMA channel. - The device issues only one interrupt per command indicating that data transfer has terminated and status is valid. If an error occurs, the read terminates at the sector where the error occurred. The Command Block Registers contain 48-bit LBA address where the error occurred. K6610170 Rev.2 Dec 22, 2004 - 76 -