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CompactFlash Memory Card Product Manual
6.0 ATA Command Description
This section defines the software requirements and
the format of the commands the host sends to the
CompactFlash Memory Cards. Commands are
issued to the CompactFlash Card by loading the
required registers in the command block with the
supplied parameters, and then writing the
command code to the Command Register. The
manner in which a command is accepted varies.
There are three classes (see Table 6-1) of command
acceptance, all dependent on the host not issuing
commands unless the CompactFlash Card is not
busy. (The BUSY bit in the status and alternate
status registers is 0.)
• Upon receipt of a Class 1 command, the
CompactFlash Card sets the BUSY bit
within 400 nsec.
56
• Upon receipt of a Class 2 command, the
• Upon receipt of a Class 3 command, the
6.1
Table 6-1 summarizes the ATA command set with
the paragraphs that
individual commands and the task file for each.
SanDisk CompactFlash Memory Card Product Manual © 1998 SANDISK CORPORATION
CompactFlash Memory Card sets the
BUSY bit within 400 nsec, sets up the
sector buffer for a write operation, sets
DRQ within 700 µsec, and clears the
BUSY bit within 400 nsec of setting DRQ.
CompactFlash Memory Card sets the
BUSY bit within 400 nsec, sets up the
sector buffer for a write operation, sets
DRQ within 20 msec (assuming no re-
assignments), and clears the BUSY bit
within 400 nsec of setting DRQ.
ATA Command Set
follow describing the
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