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T
T
T
S
S
S
1
1
1
G
G
G
~
~
~
3
3
3
2
2
2
G
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133X CompactFlash Card
Transcend Information Inc.
39
I/O Transfer Function
The I/O transfer to or from the CompactFlash Storage can be either 8 or 16 bits. When a 16 bit accessible port
is addressed, the signal -IOIS16 is asserted by the CompactFlash Storage. 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, 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. The CompactFlash Storage 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