AN2168 Freescale Semiconductor / Motorola, AN2168 Datasheet - Page 22

• Manufacturer Part Number: AN2168
• Description: ColdFire Microprocessor DMA Controller Application Note
• Manufacturer: Freescale Semiconductor / Motorola

Application Note
22
FOR AT LEAST ONE
OF EXTERNAL BUS.
NAL BUS REQUEST
THEN REASSERT
NEGATE EXTER-
REQUEST FOR
MASTERSHIP
CLOCK.
OF EXTERNAL BUS
WAIT FOR NEXT
THEN REQUEST
MASTERSHIP
REQUEST.
Figure 10. Single Address Mode DMA Flowchart
Y
DMA READ PHASE BUS CYCLE(S)
MASTERSHIP OF EXTERNAL BUS
Y
RECEIVED, AND DMA GRANTED
DMA PROGRAMMED, REQUEST
(INTERNAL OR EXTERNAL)
BCR = MULTIPLE OF BWC?
FROM SOURCE ADDRESS
BCR DECREMENTED
CYCLE STEAL?
SINC = 1?
BCR = 0?
ERROR?
N
N
N
N
N
Y
Y
Y
BUS ERROR ON SOURCE (BES)
AND DONE BITS SET IN DSR
SET DONE BIT IN DSR
SAR INCREMENTED
MOTOROLA
AN2168