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TS2GCF266 Datasheet(PDF) 39 Page - Transcend Information. Inc. |
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TS2GCF266 Datasheet(HTML) 39 Page - Transcend Information. Inc. |
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39 / 80 page  T T TS S S2 2 2G G G~ ~ ~8 8 8G G GC C CF F F2 2 26 6 66 6 6 266X CompactFlash Card Transcend Information Inc. 39 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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