IBM IC35L040AVVN07-0 Hard Drive Specifications - Page 144
Read DMA Queued C7h
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11.14 Read DMA Queued (C7h) Command Block Output Registers Register 76543210 Data -------- Feature VVVVVVVV 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 11000111 Command Block Input Registers Register 76543210 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 VV0V0V0V Status Register 7 6 5 4 3 2 10 BSY RDY DF SRV DRQ COR IDX ERR 0 V 0 V - 0 -V Figure 112. Read DMA Queued Command (C7h) This command executes in a similar manner to a READ DMA command. The device may perform a bus release or it 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 reselect the device using the SERVICE command. When the data transfer is begun, the device does not perform a bus release until the entire data transfer has been completed. Output parameters to the device Feature The number of sectors to be transferred. A value of 00h indicates that 256 sectors are to be transferred. Sector Count Bits 7 - 3 (Tag) contain the Tag for the command being delivered. Sector Number Starting sector number or LBA address bits 7 - 0. Cylinder High/Low Starting cylinder number or LBA address bits 23 - 8. H Starting head number or LBA address bits 27 - 24. Deskstar 120GXP hard disk drive specifications 130