SST48CF032 datasheet(27/60 Pages) SST

27 / 60 page

Data Sheet

CompactFlash Card

SST48CF008 / 016 / 024 / 032 / 048 / 064 / 096 / 128 / 192 / 256

S71125-03-000

9/01

375

2.5 I/O Transfer Function

2.5.1 I/O Function

The I/O transfer to or from the CompactFlash card can be either 8 or 16 bits. When a 16-bit accessible port is

addressed, the signal -IOIS16 is asserted by the CompactFlash 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 card, the system

must generate a pair of 8-bit references to access the word’s Even Byte and Odd Byte. The CompactFlash 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 card responds.

TABLE

2-16: I/O FUNCTION

Function Code

-REG

-CE2

-CE1

-IORD

-IOWR

D15-D8

D7-D0

Standby Mode

VIH

XXX

High Z

Byte Input Access

(8 bits)

VIL

VIH

VIL

VIH

VIL

VIH

High Z

Even Byte

Odd Byte

Byte Output Access

(8 bits)

VIL

VIH

VIL

VIH

VIL

Don’t Care

Even Byte

Odd Byte

Word Input Access

(16 bits)

VIL

VIH

Odd Byte

Even Byte

Word Output Access

(16 bits)

VIL

VIH

VIL

Odd Byte

Even Byte

I/O Read Inhibit

VIH

VIL

VIH

Don’t Care

I/O Write Inhibit

VIH

VIL

High Z

High Byte Input Only

(8 bits)

VIL

VIH

VIL

VIH

Odd Byte

High Z

High Byte Output

Only (8 bits)

VIL

VIH

VIL

Odd Byte

Don’t Care

T2-16.0 375

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