Fujitsu MJA2500BH Maintenance Manual - Page 104
Command descriptions, READ SECTOR S
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Interface 5.3.2 Command descriptions The contents of the shadow block registers to be necessary for issuing a command and the example indication of the shadow block registers at command completion are shown as following in this subsection. Example: READ SECTOR (S) At command issuance (Shadow Block Registers setting contents) Bit 7 6 5 4 3210 CM 0 0 1 0 0000 DH x L x x HD No./LBA CH EXP LBA (47-40) CH Start cylinder address [MSB] / LBA (23-16) CL EXP LBA (39-32) CL Start cylinder address [LSB] / LBA (15-8) SN EXP LBA (31-24) SN Start sector No. / LBA (7-0) SC EXP Transfer sector count (15-8) SC Transfer sector count (7-0) FR EXP xx FR xx At command completion (Shadow Block Registers to be read) Bit 7 6 5 4 321 0 ST Status information DH x L x x HD No./LBA CH EXP LBA (47-40) CH End cylinder address [MSB] / LBA (23-16) CL EXP LBA (39-32) CL End cylinder address [LSB] / LBA (15-8) SN EXP LBA (31-24) SN End sector No. / LBA (7-0) SC EXP X '00' SC X '00' ER Error information CH (EXP): CL (EXP): CM: DH: ER: FR (EXP): L: SN (EXP): SC (EXP): ST: x, xx: Note: 1. 2. 3. Cylinder High Field (EXP) Cylinder Low Field (EXP) Command Field Device/Head Field Error Field Features Field (EXP) LBA (Logical Block Address) setting bit Sector Number Field (EXP) Sector Count Field (EXP) Status Field Don't care (setting is not necessary). When the L bit is specified to 1, the lower 4 bits of the DH field and all bits of the CH field, CL and SN fields indicate the LBA bits (bits of the DH filed are the MSB (most significant bit) and bits of the SN field are the LSB (least significant bit). At error occurrence, the SC field indicates the remaining sector count of data transfer. Bit indication is omitted in each command description. 5-30 C141-E293