MD1050-DCC M-Systems Inc., MD1050-DCC Datasheet - Page 27

• Manufacturer Part Number: MD1050-DCC
• Description: Diskonchip Ide Pro Data Sheet
• Manufacturer: M-Systems Inc.

5.1.8
This command functions like the Read Sector(s) command, but instead of issuing interrupts for each
sector, it issues interrupts when a block is transferred that contains the counts of sectors defined by
the Set Multiple command. The DRQ required for the transfer should be set only at the start of the
data block and does not affect other sectors. When the Read Multiple command is issued, the
requested sectors (not the block counts or the sector counts in a block) are written into the Sector
Count register. Errors occurring during command execution are reported at the start of a complete
or partial block transfer. The transfer continues even if DRQ is set and the data is corrupted. After
the data transfer, the task file content (with the block data containing the sectors where the error
occurred) is undefined. To obtain valid error information the host must request a re-transmission.
The next block or part of a block is transferred only if the error is correctable. For all other errors,
the command is aborted after transferring a block containing an error.
26
Sector Number
Sector Number
Cylinder High
Cylinder High
Sector Count
Sector Count
Cylinder Low
Device/Head
Cylinder Low
Device/Head
Command
Register
Features
Register
Status
Error
Read Multiple – C4h
BSY
R
7
1
7
0
DRDY
UNC
LBA
DiskOnChip IDE Pro Data Sheet, Rev. 1.5
Cylinder[15:8] or LBA[23:16] of the sector/LBA to transfer
6
6
Cylinder[7:0] or LBA[15:8] of the sector/LBA to transfer
Sector[7:0] or LBA[7:0] of the sector/LBA to transfer
The number of sectors/logical blocks to transfer
MC
DF
1
5
5
0
0
OUTPUT
INPUT
IDNF
DSC
D
4
4
1
C4h
MCR
DRQ
3
3
0
Head (LBA 27-24)
CORR
ABRT
2
2
TKONF
IDX
1
1
0
0
91-SR-012-01-8L
AMNF
ERR
0
0
0