Motorola Espresso Maker MC68340 ユーザーズマニュアル

MOTOROLA

6- 13

NOTE:

     1.  Timing to generate more than one DMA transfer.

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

     3.  DREQx  must be asserted while DACKx is asserted and meet the setup and hold times for more than one DMA transfer to be recognized.

     4.  DONEx (input) can be asserted in either the read or write DMA bus cycle to indicate that the next DMA transfer will be the last one.

CLKOUT

A31–A0

FC3–FC0

SIZ1–SIZ0

R/W

AS

DS

DSACKx

S0

S2

S4

S0

S2

S4

S0

S2

S4

S0

S2

S4

S0

S2

S4

S0

S2

S4

D15–D0

DREQx

DACKx

DONEx

(OUTPUT)

CPU CYCLE

DMA WRITE

DMA READ

DMA WRITE

DMA READ

CPU CYCLE

DONEx

(INPUT)

F

re

e

sc

a

le

 S

e

m

ic

o

n

d

u

c

to

r,

 I

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

 

Freescale Semiconductor, Inc.

For More Information On This Product,

   Go to: www.freescale.com

n

c

.

..