6

AmC0XXCFLKA

5/4/98

Word-Wide Operations

The “C” series cards provide the flexibility to operate on

data in a byte-wide or word-wide format. In word-wide

operations the Low-bytes are controlled with CE1 when

A0 = 0. The High-bytes are controlled with CE2 with

A0 = don’t care.

Table 1.

Common Memory Bus Operations

Legend:

input levels.

Notes:

2. Manufacturer and device codes may be accessed via a command register write sequence. (Refer to Autoselect Command in

Tables 3 and 4.)

accomplished internal to the card by transposing D8–D15 to D0–D7.

8. Odd byte only access. In this x8 mode, A0 = X outputs or inputs the “odd” byte (high byte) of the x16 word on D8–D15.

9. x16 word accesses present both “even” (low) and “odd” (high) bytes. A0 = X.

Pins/Operation

REG

CE2CE1OE

WE

A0

D8–D15

D0–D7

READ-ONLY

Read (x8) (Note 6)

High-Z

Data Out-Even

Read (x8) (Note 7)

High-Z

Data Out-Odd

Read (x8) (Note 8)

X

Data Out-Odd

High-Z

Read (x16) (Note 9)

X

Data Out-Odd

Data Out-Even

Output Disable

XX

X

High-Z

High-Z

Standby (Note 3)

X

X

X

X

High-Z

High-Z

READ/WRITE

Read (x8) (Notes 2, 6)

High-Z

Data Out-Even

Read (x8) (Notes 2, 7)

High-Z

Data Out-Odd

Read (x8) (Notes 2, 8)

X

Data Out-Odd

High-Z

Read (x16) (Notes 2, 9)

X

Data Out-Odd

Data Out-Even

Write (x8) (Notes 4, 6)

High-Z

Data In-Even

Write (x8) (Notes 4, 7)

High-Z

Data In-Odd

Write (x8) (Notes 4, 8)

X

Data In-Odd

High-Z

Write (x16) (Notes 5, 9)

X

Data In-Odd

Data In-Even

Output Disable

XX

X

High-Z

High-Z

Standby (Note 3)

X

X

X

X

High-Z

High-Z

Volt-only?