TS2G~8GCF266
266X CompactFlash Card
I/O Transfer Function
The I/O transfer to or from the CompactFlash Storage or CF+ Card can be either 8 or 16 bits. When a 16 bit
accessible port is addressed, the signal -IOIS16 is asserted by the CompactFlash Storage or CF+ Card.
Otherwise, the -IOIS16 signal is de-asserted. When a 16 bit transfer is attempted, and the -IOIS16 signal is
not asserted by the CompactFlash Storage or CF+ Card, the system shall generate a pair of 8 bit references
to access the word‘s even byte and odd byte. The CompactFlash Storage Card permits both 8 and 16 bit
accesses to all of its I/O addresses, so -IOIS16 is asserted for all addresses to which the CompactFlash
Storage responds. CF+ cards may or may not allow 16 bit register accesses and thus shall assert -IOIS16 as
required. The CompactFlash Storage and CF+ Card may request the host to extend the length of an input
cycle until data is ready by asserting the -WAIT signal at the start of the cycle.
Table : PCMCIA Mode I/O Function
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