ATA COMMAND BLOCK AND SET DESCRIPTION |
Read Buffer — E4h
The Read Buffer command allows the host to read the contents of the sector buffer. When issued, the device sets the BSY bit and sets up the sector buffer data in preparation for the read operation. When the data is ready, the DRQ bit is set and the BSY bit in the Status register are set and cleared, respectively.
Table 40: Read Buffer — E4h
Register | D7 | D6 | D5 | D4 |
| D3 | D2 |
| D1 | D0 |
Feature |
|
|
| X |
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
| |
Sector Count |
|
|
| X |
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
| |
Sector Number |
|
|
| X |
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
| |
Cylinder Low |
|
|
| X |
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
| |
Cylinder High |
|
|
| X |
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
| |
Drive Head | X | X | X | Drive |
|
|
| X |
| |
|
|
|
|
|
|
|
|
|
|
|
Command |
|
|
| E4h |
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
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All unauthorized use and/or reproduction is prohibited.
DOCUMENT: | JUNE 17, 2008 | PAGE 39 |