Hitachi 7K400 Specifications - Page 178
Read Multiple Ext 29h
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12.23 Read Multiple Ext (29h) Table 123: Read DMA Ext Command (25h) Command Block Output Registers Register 7 6 5 4 3 2 1 0 Data Low Data High Feature Current 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 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 0 1 0 0 1 76 CRC UNC 0V Error Register 54 3 2 1 0 0 IDN 0 ABT T0N AMN 0V 0 V 0 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 See below ... Status Register 7 654 3 2 1 0 BSY RDY DF DSC DRQ COR IDX ERR 0 V0V - 0 - V The Read Multiple Ext 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. Command execution is identical to the Read Sector(s) command except that an interrupt is generated for each block (as defined by the Set Multiple command) instead of for each 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 0000h in the Sector Count register is specified, 65,536 sectors will be transferred. 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 164
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