Computer Drive - Floppy Disk Drive User Manual

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Interface

5-132 C141-E224

(43) WRITE DMA EXT (X’35’)

• Description

This command is the extended command of the WRITE DMA command. The

LBA specification is increased from 28 bits to 48 bits, and the maximum number

of sectors that can be transferred by a single command is changed from 100h to

10000h. Other command controls are the same as those of the WRITE DMA

command.

• Error reporting conditions

(1) The command was issued in CHS mode (ST = 51h, ER = 04h).

The other error reporting conditions are the same as those of the WRITE

DMA command.

At command issuance (Shadow Block Registers setting contents)

CM 0 0 1 1 0 1 0 1

DH 1 L 1 x xx

CH EXP

CL EXP

SN EXP

SC EXP

FR EXP

LBA (47-40)

LBA (23-16)

LBA (39-32)

LBA (15-8)

LBA (31-24)

LBA (7-0)

Sector count (15-8)

Sector count (7-0)

At command completion (Shadow Block Registers contents to be read)

ST Status information