Hitachi HTS541680J9SA00 Specifications - Page 95
Read DMAC8h/C9h
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Travelstar 5K160 (SATA) Hard Disk Drive Specification 14.13 Read DMA(C8h/C9h) Command Block Output Registers Register 76543210 Data -------- Feature -------- Sector Count VVVVVVVV LBA Low VVVVVVVV LBA Mid VVVVVVVV LBA High VVVVVVVV Device - L - - HHHH Command 1 1 0 0 1 0 0R Command Block Input Registers Register 76543210 Data -------- Error ...See Below... Sector Count VVVVVVVV LBA Low VVVVVVVV LBA Mid VVVVVVVV LBA High VVVVVVVV Device - - - - HHHH Status ...See Below... Error Register 7 6 5 4 3 2 1 0 CRC UNC 0 IDN 0 ABT T0N AM N VV 0 V 0 V 0 0 Figure 46 Read DMA Command (C8h/C9h) Status Register 7 6543 2 10 BSY RDY DF DSC DRQ COR IDX ERR 0V0V - 0 0V 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 The number of continuous sectors to be transferred. If zero is specified, then 256 sectors will be transferred. LBA Low The sector number of the first sector to be transferred. (L=0) In LBA mode, this register specifies LBA address bits 0 - 7 to be transferred. (L=1) LBA High/Mid The cylinder number of the first sector to be transferred. (L=0) In LBA mode, this register specifies LBA address bits 8 - 15 (Mid) 16 - 23 (High) to be transferred. (L=1) H The head number of the first sector to be transferred. (L=0) In LBA mode, this register specifies LBA bits 24-27 to be transferred. (L=1) R The retry bit, but this bit is ignored. Input Parameters From The Device Sector Count The number of requested sectors not transferred. This will be zero, unless an unrecoverable error occurs. LBA Low The sector number of the last transferred sector. (L=0) In LBA mode, this register contains current LBA bits 0 - 7. (L=1) LBA High/Mid The cylinder number of the last transferred sector. (L=0) In LBA mode, this register contains current LBA bits 8 - 15 (Mid), 16 - 23 (High). (L=1) H The head number of the sector to be transferred. (L=0) In LBA mode, this register contains current LBA bits 24 - 27. (L=1) 95/167