Hitachi HTS541040G9AT00 Specifications - Page 138
Read DMA C8h/C9h
UPC - 000059826569
View all Hitachi HTS541040G9AT00 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 138 highlights
13.13 Read DMA (C8h/C9h) Table 83: Read DMA command (C8h/C9h) Command Block Output Registers Register 7 6 5 4 3 2 1 0 Data Feature Sector Count V V V V V V V V LBA Low V V V V V V V V LBA Mid V V V V V V V V LBA High V V V V V V V V Device 1 L 1 D H H H H Command 1 1 0 0 1 0 0 R 76 CRC UNC 00 Error Register 54 3 2 1 0 0 IDN 0 ABT T0N AMN 00 0 V 0 0 Command Block Input Registers Register 7 6 5 4 3 2 1 0 Data Error see below Sector Count V V V V V V V V LBA Low V V V V V V V V LBA Mid V V V V V V V V LBA High V V V V V V V V Device - - - - - H H H H Status 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 and then transfers the data from the device to the host. It transfers the sectors 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 the DMARQ and are performed by the slave-DMA channel. The device issues only one interrupt per command to indicate that the data transfer has terminated and that status is available. If an uncorrectable error occurs, the read will be terminated at the failing sector. Output parameters to the device Sector Count This indicates the number of continuous sectors to be transferred. If zero is specified, 256 sectors will be transferred. LBA Low This indicates the sector number of the first sector to be transferred. (L = 0). In LBA mode, this register specifies that LBA address bits 0-7 are to be transferred (L = 1) LBA High/Mid This indicates the cylinder number of the first sector to be transferred. (L = 0). In LBA mode this register specifies LBA address bits 8-15 (Mid) and 16-23 (High) to be transferred. (L = 1) H This indicates the head number of the first sector to be transferred. (L = 0). In LBA mode this register specifies the LBA bits 24-27 to be transferred. (L = 1) R This indicates the retry bit, but this bit is ignored. Travelstar 5K100 Hard Disk Drive Specification 124