MC68340 datasheet(86/441 Pages) FREESCALE

No. de pieza	MC68340

Descripción Electrónicos	Integrated Processor with DMA User?셲 Manual

PDF	441 Pages

Scroll/Zoom	100%

Fabricante Electrónico	FREESCALE [Freescale Semiconductor, Inc]

Página de inicio	http://www.freescale.com

Logo

86 / 441 page

MOTOROLA

MC68340 USER’S MANUAL

3- 37

READ RERUN

HALT

READ CYCLE WITH

RETRY

DATA

IGNORED

CLKOUT

DSACKx

R/W

BERR

A31–A0

FC3–FC0

D15–D0

HALT

Figure 3-19. Retry Sequence

The MC68340 retries any read or write cycle of a read-modify-write operation separately;

RMC remains asserted during the entire retry sequence. Asserting BR along with BERR

and

HALT provides a relinquish and retry operation. The MC68340 does not relinquish the

bus during a read-modify-write operation. Any device that requires the MC68340 to give

up the bus and retry a bus cycle during a read-modify-write cycle must assert only

BERR

and

BR (HALT must not be included). The bus error handler software should examine the

read-modify-write bit in the special status word (see Section 5 CPU32) and take the

appropriate action to resolve this type of fault when it occurs.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MC68340 Datasheet(PDF) 86 Page - Freescale Semiconductor, Inc