PXS20RM Datasheet, PDF (294/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Cyclic Redundancy Checker (CRC) Unit
Tx flow
Rx flow
MEM
Payload
DMA
(mem2mem,
channel x)
CRC
(Context x)
CRC_INP
CRC_OUTP
Phase 1 (Tx)
MEM
Payload
CRC
CPU
CRC
(Context x)
CRC_INP
CRC_OUTP
Phase 2 (Tx)
MEM
Payload
DMA
(periph2mem,
channel x)
SPI
RX fifo
CRC
Phase 1 (Rx)
MEM
Payload
CRC
DMA
(mem2mem,
channel x)
CRC
(Context x)
CRC_INP
CRC_OUTP
Phase 2 (Rx)
MEM
Payload
DMA
(mem2periph,
channel x)
SPI
TX fifo
CRC
Phase 3 (Tx)
CPU
Check
CRC
(Context x)
CRC_INP
CRC_OUTP
Phase 3 (Rx)
Figure 14-9. DMA-CRC (Tx flow, Rx flow)
14-10
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor