T
T
T
S
S
S
3
3
3
2
2
2
M
M
M
~
~
~
1
1
1
G
G
G
C
C
C
F
F
F
8
8
8
0
0
0
80X CompactFlash Card
Transcend Information Inc.
V1.1
34
The CompactFlash Storage Card can be configured in a True IDE Mode of operation. The CompactFlash
Storage Card is configured in this mode only when the -OE input signal is grounded by the host during the power off
to power on cycle. Optionally, CompactFlash Storage Cards may support the following optional detection methods:
1. The card is permitted to monitor the –OE (-ATA SEL) signal at any time(s) and switch to PCMCIA mode upon
detecting a high level on the pin.
2. The card is permitted to re-arbitrate the interface mode determination following a transition of the (-)RESET pin.
3. The card is permitted to monitor the –OE (-ATA SEL) signal at any time(s) and switch to True IDE mode upon
detection of a continuous low level on pin for an extended period of time.
Notes: 1) Implemented for backward compatibility. Bit D7 of the register shall remain High Z to prevent conflict with any
floppy disk controller at the same address. The host software should not rely on the contents of this register
.
