CHAPTER 25:Programmable CRC
S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G
961
Figure 3-3 CRC Operation with DMA Request
ISR of DMA transfer
−finished−IRQ
CRCn_CFG:CDEN =
’0’
Disable CRC DMA request
Clear DMA interrupt flag
Read checksum from CRCn_RD
CRCn_CFG:LOCK ==
’0’
controller.
START
Wait till previous
CRC calculation is
completed.
No
Yes
CRCn_CFG
CRCn_POLY
CRCn_SEED
CRCn_FXOR
Configure:
Settings for DMA request generation:
CRCn_CFG:CIEN =
’0’
Configure DMA transfer
CRCn_CFG:CDEN =
’1’
Enable CRC DMA request
Re
−configure DMA transfer
Enable CRC DMA request
CRCn_CFG:CDEN =
’1’
Yes
Next block
written?
to be
No
Note:
DMA request is cleared on receiving
DMA request will be enabled later when
configuration is finished.
DMA acknowledgment from DMA
Содержание S6J3200 Series
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