Operation Flow - Fujitsu MB91260B Series Hardware Manual

CHAPTER 16 DMAC (DMA Controller)
16.7

Operation Flow

This section shows the flowchart of the DMAC block transfer and burst transfer.
■ Block Transfer
Block transfer
- Starting is possible by all starting factors (option)
- Accessing is possible to all areas
- Setting of block number is possible.
- Generating interrupt clear at the block number end
- Generating DMA interrupt at designated transfer count end
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Figure 16.7-1 Flowchart of Block Transfer
DMA stop
DENB=>0
DENB=1
Wait start request
Reload enable
Start request
Initial
Load address, transfer
count, and block number
Address operation for
transfer source address access
Address operation for
transfer destination address access
Block number - 1
BLK=0
Transfer count - 1
Write back address, transfer
count, and block number
DMA transfer end
At only select peripheral interrupt start source
Clear interrupt
Generating interruption clear
DTC=0
Generating DMA interrupt