Operation Flowcharts - Fujitsu MB91460 SERIES FR60 User Manual

4. Operation Flowcharts

This section contains operation flowcharts for the following transfer modes:
• Block transfer
• Burst transfer
• Demand transfer
■ Block Transfer
Figure 4-1"Operation Flowchart for Block Transfer" shows the flowchart for block transfer.
DENB=>0
Reload enable
Block transfer
- Can be activated by all activation sources (selection).
- Can access to all areas.
- The number of blocks can be set.
- Interrupt clear is issued when transfer of the specified
number of blocks is completed.
- The DMA interrupt is issued when transfer for the number
of times specified is completed.
■ Burst Transfer
Figure 4-2"Operation Flowchart for Burst Transfer" shows the operation flowchart for burst transfer.
Figure 4-1 Operation Flowchart for Block Transfer
DMA stop
DENB=1
Activation request
wait
Activation request
Load the initial address,
transfer count, and number
of blocks
Calculate the address for
transfer source address access
Calculate the address for transfer
destination address access
Number of blocks - 1
BLK=0
Transfer count - 1
Write back the address,
transfer count, and
number of blocks
DMA transfer end
One-time access for fly-by
Only when the peripheral
interrupt activation source
is selected
Interrupt cleared
Interrupt clear
DTC=0
DMA interrupted
Chapter 26 DMA Controller
4.Operation Flowcharts
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