Hitachi HTS541010G9AT00 Specifications - Page 117
Read DMA EXT 25h
UPC - 000061425019
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12.14 Read DMA EXT (25h) Table 67: Read DMA EXT (25h) Command Block Output Registers Register 7 6 5 4 3 2 1 0 Data Low Data High Current Feature Previous Sector Count Current Previous V V V V V V V V V V V V V V V V Current LBA Low Previous V V V V V V V V V V V V V V V V Current LBA Mid Previous V V V V V V V V V V V V V V V V Current LBA High Previous V V V V V V V V V V V V V V V V Device 1 1 1 - - - - - Command 0 0 1 0 0 1 0 1 76 CRC UNC VV Error Register 54 3 2 1 0 0 IDN 0 ABT T0N AMN 0V 0 V 0 0 Command Block Input Registers Register 7 6 5 4 3 2 1 0 Data Low Data High Error see below Sector Count LBA Low LBA Mid LBA High Device Status HOB=0 HOB=1 HOB=0 HOB=1 HOB=0 HOB=1 HOB=0 HOB=1 V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V See below ... Status Register 7 654 3 2 1 0 BSY RDY DF DSC DRQ COR IDX ERR 0 V0V - 0 - V The Read DMA command reads one or more sectors of data from disk media, then transfers the data from the device to the host. The sectors are transferred through the Data Register 16 bits at a time. The host initializes a slave-DMA channel prior to issuing the command. The data transfers are qualified by DMARQ and are performed by the slave-DMA channel. The device issues only one interrupt per command to indicate that data transfer has terminated and status is available. If an uncorrectable error occurs, the read will be terminated at the failing sector Output parameters to the device Sector Count Current This indicates the number of sectors to be transferred low order, bits (7-0) Sector Count Previous This indicates the number of sectors to be transferred high order, bits (15-8). If 0000h in the Sector Count register is specified, 65.536 sectors will be transferred. LBA Low Current LBA (7-0) LBA Low Previous LBA (31-24) LBA Mid Current LBA (15-8) LBA Mid Previous LBA (39-32) LBA High Current LBA (23-16) LBA High Previous LBA (47-40) Travelstar 5K100 (Serial ATA) Hard Disk Drive Specification 105