MC68340 datasheet(62/441 Pages) FREESCALE

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MOTOROLA

MC68340 USER’S MANUAL

3- 13

CLKOUT

A31–A0

FC3–FC0

SIZ0

SIZ1

D15–D8

D7–D0

R/W

DSACK0

DSACK1

2 BYTES

4 BYTES

2 BYTES

OP0

OP1

OP2

OP3

OP0

OP1

OP0

OP2

OP0

OP1

OP3

OP1

WORD READ

FROM 16-BIT BUS

LONG WORD WRITE TO

16-BIT BUS

WORD

WRITE TO

16-BIT BUS

LONG WORD READ

FROM 16-BIT BUS

4 BYTES

Figure 3-5. Long-Word and Word Read and Write Timing—16-Bit Port

The MC68340 drives the address bus with the desired address and drives the SIZx pins to

indicate a long-word operand. For a read operation, the slave responds by placing the two

most significant bytes of the operand on bits 15–0 of the data bus and asserting

DSACK1

to indicate a 16-bit port. The MC68340 reads the two most significant bytes of the operand

(bytes 0 and 1) from bits 15–0. The MC68340 then decrements the transfer size counter

by 2, increments the address by 2, initiates a new cycle, and reads bytes 2 and 3 of the

operand from bits 15–0 of the data bus.

For a write operation, the MC68340 drives the two most significant bytes of the operand

on bits 15–0 of the data bus. The slave device then reads the two most significant bytes of

the operand (bytes 0 and 1) from bits 15–0 of the data bus and asserts

DSACK1 to

indicate reception and a 16-bit port. The MC68340 then decrements the transfer size

counter by 2, increments the address by 2, and writes bytes 2 and 3 of the operand to bits

15–0 of the data bus.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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