Computer Drive - Floppy Disk Drive User Manual

Interface
5-124 C141-E224
(38) READ DMA EXT (X’25’)
• Description
This command is the extended command of the READ 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
READ 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 READ DAM
command.
At command issuance (Shadow Block Registers setting contents)
CM 0 0 1 0 0 1 0 1
DH 1 L 1 x xx
CH EXP
CH
CL EXP
CL
SN EXP
SN
SC EXP
SC
FR EXP
FR
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)
xx
xx
At command completion (Shadow Block Registers contents to be read)
ST Status information
DH 1 L 1 x xx
CH EXP
CH
CL EXP
CL
SN EXP
SN
SC EXP
SC
ER
LBA (47-40)
LBA (23-16)
LBA (39-32)
LBA (15-8)
LBA (31-24)
LBA (7-0)
xx
xx
Error information