MD1050-DCC M-Systems Inc., MD1050-DCC Datasheet - Page 28

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

5.1.9
This command allows the host to read up to 256 sectors as specified in the Sector Count register. A
sector count of 0 indicates a transfer request of 256 sectors. The transfer starts from the sector
specified in the Sector Number register. DRQ is set prior to the transfer, regardless of the error
state. The command ends by placing the cylinder, head and sector number of the last read sector in
the task file. If an error occurs, the read operation aborts in the sector with the error. The Cylinder,
Head and Sector number of the sector with the error is placed in the task file. The error data remains
in the data buffer. The Cylinder Low, Cylinder High, Device/Head and Sector Number or LBA
registers specify the starting sector address to be read. The Sector Count register specifies the
number of sectors to be transferred.
27
Sector Number
Sector Number
Cylinder High
Cylinder High
Sector Count
Sector Count
Cylinder Low
Device/Head
Cylinder Low
Device/Head
Command
Register
Register
Features
Status
Error
Read Sector(s) – 20h, 21h
BSY
R
7
1
7
0
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
1
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
20h (with retry) and 21h (without retry)
MC
DF
5
1
5
0
0
OUTPUT
INPUT
IDNF
DSC
D
4
4
1
H[3:0] or LBA[27:24] of the sector/LBA to
MCR
DRQ
3
3
0
CORR
ABRT
2
2
transfer
TKONF
IDX
1
1
0
0
91-SR-012-01-8L
AMNF
ERR
0
0
0