Table 92 Read Buffer Command (E4H); Read Buffer (E4H) - Hitachi HDS723020BLA642 Specifications
3.5 inch serial ata hard disk drive
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- Datasheet (2 pages) ,
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11.14 Read Buffer (E4h)
Command Block Output Registers
Register
Data
Feature
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Command
7
6
5
CRC UNC
0
0
0
0
Table 92 Read Buffer Command (E4h)
The Read Buffer command transfers a sector of data from the sector buffer of device to the host.
The sector is transferred through the Data Register 16 bits at a time.
The sector transferred will be from the same part of the buffer written to by the last Write Buffer command. The
contents of the sector may be different if any reads or writes have occurred since the Write Buffer command was
issued.
7
6
5
4
3
2
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
-
1
D
-
-
1
1
1
0
0
1
Error Register
4
3
2
1
IDN
0
ABT T0N AMN
0
0
V
0
Hitachi hard disk drive specifications
Command Block Input Registers
1
0
Register
-
-
Data
-
-
Error
-
-
Sector Count
-
-
Sector Number
-
-
Cylinder Low
-
-
Cylinder High
-
-
Device/Head
0
0
Status
0
7
6
5
BSY RDY
DF
0
0
V
0
141
7
6
5
4
3
2
1
-
-
-
-
-
-
-
...See Below...
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
...See Below...
Status Register
4
3
2
1
DSC DRQ COR IDX ERR
-
-
0
-
0
-
-
-
-
-
-
0
V
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