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T
T
T
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M
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80X CompactFlash Card
Transcend Information Inc.
61
5.6.13 Read Sector(s) - 20h or 21h
This command reads from 1 to 256 sectors as specified in the Sector Count register. A sector count of 0 requests 256
sectors. The transfer begins at the sector specified in the Sector Number Register. When this command is issued and
after each sector of data (except the last one) has been read by the host, the CompactFlash Storage Card sets BSY, puts
the sector of data in the buffer, sets DRQ, clears BSY, and generates an interrupt. The host then reads the 512 bytes of
data from the buffer.
At command completion, the Command Block Registers contain the cylinder, head and sector number of the last sector
read. If an error occurs, the read terminates at the sector where the error occurred. The Command Block Registers
contain the cylinder, head, and sector number of the sector where the error occurred. The flawed data is pending in the
sector buffer.
5.6.14 Read Verify Sector(s) - 40h or 41h
This command is identical to the Read Sectors command, except that DRQ is never set and no data is transferred to the
host. When the command is accepted, the CompactFlash Storage Card sets BSY.
When the requested sectors have been verified, the CompactFlash Storage Card clears BSY and generates an interrupt.
Upon command completion, the Command Block Registers contain the cylinder, head, and sector number of the last
sector verified.
If an error occurs, the Read Verify Command terminates at the sector where the error occurs. The Command Block
Registers contain the cylinder, head and sector number of the sector where the error occurred. The Sector Count
Register contains the number of sectors not yet verified.