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4.7
True IDE Mode I/O Transfer Function
4.7.1
True IDE Mode I/O Function
The
CompactFlash
configured in a True IDE Mode of operation. This
CompactFlash Card is configured in this mode
only when the -OE input signal is grounded by the
host. In this True IDE Mode, the PCMCIA protocol
and configuration are disabled and only I/O
operations to the Task File and Data Register are
allowed. In this mode, no Memory or Attribute
Registers
are
accessible
CompactFlash Cards permit 8 bit data accesses if
the user issues a Set Feature Command to put the
device in 8 bit Mode.
Table 4-17 IDE Mode I/O Function
Function Code
Invalid Mode
Standby Mode
Task File Write
Task File Read
Data Register
Write
Data Register
Read
Control Register
Write
Alt Status Read
SanDisk CompactFlash Memory Card Product Manual © 1998 SANDISK CORPORATION
CompactFlash Memory Card Product Manual
Memory
Card
can
to
the
host.
-CE2
-CE1
A0
L
L
X
H
H
X
H
L
1-7h
H
L
1-7h
H
L
0
H
L
0
L
H
6h
L
H
6h
be
Note:
Removing and reinserting the CompactFlash
Memory Card while the host computer's power is
on will reconfigure the CompactFlash Card to PC
Card ATA mode from the original True IDE Mode.
To configure the CompactFlash Card in True IDE
Mode, the 68-pin socket must be power cycled
with the CompactFlash Card inserted and -OE
(output enable) grounded by the host.
The following table defines the function of the
operations for the True IDE Mode.
- I O R D
- I O W R
X
X
X
X
H
L
L
H
H
L
L
H
H
L
L
H
D15-D8
D7-D0
High Z
High Z
High Z
High Z
Don't Care
Data In
High Z
Data Out
Odd-Byte
Even-Byte
In
In
Odd-Byte
Even-Byte
Out
Out
Don't Care
Control In
High Z
Status Out
45
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