MC68340 datasheet(272/441 Pages) FREESCALE

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6- 22

MC68340 USER’S MANUAL

MOTOROLA

...

NOTE

1. To cause another DMA transfer, the 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 WRITE

DMA READ

DMA WRITE

Figure 6-14. Fast Termination Option (External Burst–Source Requesting)

6.7 REGISTER DESCRIPTION

The following paragraphs contain a detailed description of each register and its specific

function. Figure 6-15 is a programmer's model (register map) of all registers in the DMA

module. Each channel has an independent set of registers. For more information about a

particular register, refer to the individual register description. The ADDRESS column

indicates the offset of the register from the base address of the DMA channel. The FC

column designation of S indicates that register access is restricted to supervisor only. A

designation of S/U indicates that access is governed by the SUPV bit in the module

configuration register (MCR).

Unimplemented memory locations return logic zero when accessed. All registers support

both byte and word transfers.

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MC68340 데이터시트(PDF) 272 Page - Freescale Semiconductor, Inc