Hitachi 7K400 Specifications - Page 244
Write DMA Queued Ext 36h
UPC - 000053412935
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12.53 Write DMA Queued Ext (36h) Table 173: Write DMA Queued Ext Command (36h) Command Block Output Registers Register 7 6 5 4 3 2 1 0 Data Low Data High Feature Current V V V V V V V V Previous V V V V V V V V Sector Count Current Previous 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 High Previous V V V V V V V V V V V V V V V V Device/Head - 1 - D - - - - Command 0 0 1 1 0 1 1 0 Command Block Input Registers Register 7 6 5 4 3 2 1 0 Data Low Data High Error see below Sector HOB=0 Count HOB=1 Sector HOB=0 Number 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 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 This command executes in a similar manner to a WRITE DMA EXT command. The device may perform a bus release or may execute the data transfer without performing a bus release if the data is ready to transfer. If the device performs a bus release, the host shall re-select the device using the SERVICE command. Once the data transfer is begun, the device shall not perform a bus release until the entire data transfer has been completed. Output parameters to the device Feature Current The number of continuous sectors to be transferred low order, bits (7:0) Feature Previous The number of continuous sectors to be transferred low order, bits (15:8). A value of 0000h in the Feature register indicates that 65,536 sectors are to be transferred. Sector Count Current Bits 7 - 3 (Tag) contain the Tag for the command being delivered. Sector Number Current LBA (7:0) Sector Number Previous LBA (31:24) Cylinder Low Current LBA (15:8) Cylinder Low Previous LBA (39:32) Cylinder High Current LBA (23:16) Cylinder High Previous LBA (47:40) Deskstar 7K400 Hard Disk Drive Specification 230