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7K500 OEM Specification
Page 120 of 176
14.22
14.2214.22
14.22 Read Sector(s) (20h/21h)
Read Sector(s) (20h/21h) Read Sector(s) (20h/21h)
Read Sector(s) (20h/21h)
Command Block Output Registers
Command Block Input Registers
Register 7
6
5
4
3
2
1
0
Register 7
6
5
4
3
2
1
0
Data -
-
-
-
-
-
-
-
Data -
-
-
-
-
-
-
-
Feature -
-
-
-
-
-
-
-
Error ...See Below...
Sector Count V
V
V
V
V
V
V
V
Sector Count V
V
V
V
V
V
V
V
LBA Low V
V
V
V
V
V
V
V
LBA Low V
V
V
V
V
V
V
V
LBA Mid V
V
V
V
V
V
V
V
LBA Mid V
V
V
V
V
V
V
V
LBA High V
V
V
V
V
V
V
V
LBA High V
V
V
V
V
V
V
V
Device -
L
-
-
H
H
H
H
Device -
-
-
-
H
H
H
H
Command 0
0
1
0
0
0
0
R
Status ...See Below...
Error Register
Status Register
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
CRC
UNC
0 IDN
0 ABT
T0N
AM
N
BSY
RDY
DF
DSC
DRQ
COR
IDX
ERR
0 V 0 V 0 V 0 0
0 V 0 V - 0 0 V
Table 88 Read Sector(s) Command (20h/21h)
The Read Sector(s) command reads one or more sectors of data from disk media, then transfers the
data from the device to the host.
The sectors are transferred through the Data Register 16 bits at a time.
If an uncorrectable error occurs, the read will be terminated at the failing sector.
Output Parameters To The Device
Sector Count
The number of continuous sectors to be transferred. If zero is specified, then 256 sectors
will be transferred.
LBA Low
The sector number of the first sector to be transferred. (L=0)
In LBA mode, this register contains LBA bits 0 - 7. (L=1)
LBA High/Mid
The cylinder number of the first sector to be transferred. (L=0)
In LBA mode, this register contains LBA bits 8 - 15 (Mid), 16 - 23 (High). (L=1)
H
The head number of the first sector to be transferred. (L=0)
In LBA mode, this register contains LBA bits 24 - 27. (L=1)
R
The retry bit, but this bit is ignored.
Input Parameters From The Device
Sector Count
The number of requested sectors not transferred. This will be zero, unless an
unrecoverable error occurs.
LBA Low
The sector number of the last transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 0 - 7. (L=1)
LBA High/Mid
The cylinder number of the last transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 8 - 15 (Mid), 16 - 23 (High).
(L=1)
H
The head number of the last transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 24 - 27. L=1