MC68340 datasheet(271/441 Pages) FREESCALE

Part #	MC68340

Description	Integrated Processor with DMA User?셲 Manual

PDF	441 Pages

Scroll/Zoom	100%

Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

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271 / 441 page

MOTOROLA

MC68340 USER’S MANUAL

6- 21

........

. .......

NOTE:

1. To cause another DMA transfer, DREQx is asserted after DACKx is asserted and before

DACKx is negated.

2. DACKx and DONEx (DMA control signals) are asserted in the source (read) DMA cycle.

A31–A0

FC3–FC0

SIZ1–SIZ0

R/W

DSACKx

D15–D0

DREQx

DACKx

DONEx

(OUTPUT)

DMA READ

CPU CYCLE

CLKOUT

CPU CYCLE

DMA READ

Figure 6-13. Fast Termination Option (Cycle Steal)

If the fast termination option is used with external burst request mode (Figure 6-14), an

extra DMA cycle may result on every burst transfer. Normally,

DREQ

≈ is negated when

DACK

≈ is returned. In the burst mode with fast termination selected, a new cycle starts

even if

DREQ

≈ is negated simultaneously with DACK≈ assertion.

Freescale Semiconductor, Inc.

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MC68340 Datasheet(PDF) 271 Page - Freescale Semiconductor, Inc