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12.17 Read Buffer DMA (E9h)
The Read Buffer DMA 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.
Table 117 Read Buffer DMA Command (E9h)
Command Input
Field
Description
FEATURE
N/A
COUNT
N/A
LBA
N/A
DEVICE
Bit Description
7 Obsolete
6 N/A
5 Obsolete
4 Transport Dependent
3:0 Reserved
Command
7:0 E9h
Normal Outputs
See Normal Outputs in Section 12.7 Flush Cache (E7h)
Error Register
See Error Register in Section 12.4 Download Microcode (92h)
185
Hard Disk Drive Specification