SMCXXXBF datasheet(39/91 Pages) STMICROELECTRONICS

Part #	SMCXXXBF

Description	32MByte, 64MByte, 128MByte, 256MByte, 512MByte, 1GByte, 2GByte, and 4GByte 3.3/5V Supply CompactFlash??Card

PDF	91 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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39 / 91 page

SMCxxxBF

Card Configuration

39/91

6.6

I/O Transfer Function

The I/O transfer to or from the Card can be either 8 or 16 bits. When a 16 bit accessible

port is addressed, the –IOIS16 signal is asserted by the Card, otherwise it is de-asserted.

When a 16 bit transfer is attempted, and the –IOIS16 signal is not asserted, the system must

generate a pair of 8 bit references to access the Word’s even and odd Bytes. The Card

permits both 8 and 16 bit accesses to all of its I/O addresses, so –IOIS16 is asserted for all

addresses (see Table 33).

Table 33.

I/O Function

Function Code

–REG

–CE2

–CE1

–IORD

–IOWR

D15 to D8

D7 to D0

Standby Mode

High Z

Byte Input Access

(8 bits)

High Z

Even Byte

Odd Byte

Byte Output Access

(8 bits)

Don’t Care

Even Byte

Odd Byte

Word Input Access

(16 bits)

Odd Byte

Even Byte

Word Output Access

(16 bits)

Odd Byte

Even Byte

I/O Read Inhibit

Don’t Care

I/O Write Inhibit

High Z

High Byte Input Only

(8 bits)

Odd Byte

High Z

High Byte Output

Only

(8 bits)

Odd Byte

Don’t Care

SMCXXXBF Datasheet(PDF) 39 Page - STMicroelectronics

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