Hitachi IC25N040ATCS04-0 Specifications - Page 198
Write DMA CAh/CBh
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13.36 Write DMA (CAh/CBh) 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 Sector Number V V V V V V V V Cylinder Low V V V V V V V V Cylinder High V V V V V V V V Device/Head 1 L 1 D H H H H Command 1 1 0 0 1 0 1 R 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 Sector Number V V V V V V V V Cylinder Low V V V V V V V V Cylinder High V V V V V V V V Device/Head - - - - H H H H Status see below Error Register 76543210 CRC UNC 0 IDN 0 ABT T0N AMN V00V0V00 Status Register 7 6 5 4 3 2 10 BSY RDY DF DSC DRQ COR IDX ERR 0 V V V - 0 -V Figure 137. Write DMA command (CAh/CBh) The Write DMA command transfers one or more sectors of data from the host to the device and then the data is written to the disk media. The sectors of data are transferred through the Data Register16 bits at a time. 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 to indicate that data transfer has terminated and status is available. If an uncorrectable error occurs, the write 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, then 256 sectors will be transferred. Sector NumberThis indicates the sector number of the first sector to be transferred. (L = 0) In LBA mode this register contains the LBA bits 0-7. (L = 1) Cylinder High/Low This indicates number of the first sector to be transferred. (L = 0) In LBA mode this register contains the LBA bits 8-15 (Low) and bits 16-23 (High). (L = 1 H This indicates the head number of the first sector to be transferred. (L = 0) In LBA mode this register contains the LBA bits 24-27. (L = 1) Hitachi Travelstar 60GH & 40GN hard disk drive specifications 185
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