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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
Transcend Information Inc.
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80X CompactFlash Card
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