Hitachi T7K250 Specifications - Page 234
Write DMA Ext 35h
UPC - 000062373678
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12.49 Write DMA Ext (35h) 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 Sector Number Current Previous V V V V V V V V V V V V V V V V Cylinder Current Low Previous V V V V V V V V V V V V V V V V Cylinder Current V V V V V V V V High Previous V V V V V V V V Device/Head - 1 - D - - - - Command 0 0 1 1 1 1 0 1 Command Block Input Registers Register 7 6 5 4 3 2 1 0 Data Low Data High Error see below Sector Count HOB=0 HOB=1 Sector Number HOB=0 HOB=1 Cylinder HOB=0 Low HOB=1 Cylinder HOB=0 High HOB=1 Device/Head Status 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 ... 76 CRC UNC V0 Error Register 54 3 2 1 0 0 IDN 0 ABT T0N AMN 0V 0 V 0 0 Status Register 7 654 3 2 1 0 BSY RDY DF DSC DRQ COR IDX ERR 0 V0V - 0 - V The Write DMA Ext 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 Register 16 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 Current The number of continuous sectors to be transferred low order, bits (7:0). Sector Count Previous The number of continuous sectors to be transferred high order bits (15:8). If zero is speci- fied in the Sector Count register, then 65,536 sectors will be transferred. Sector Number CurrentLBA (7:0) Sector Number PreviousLBA (31:24) Cylinder Low Current LBA (15:8) Cylinder Low PreviousLBA (39:32) Cylinder High CurrentLBA (23:16) Cylinder High PreviousLBA (47:40) Deskstar T7K250 Hard Disk Drive Specification 220