PXD20RM Datasheet, PDF (1015/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

Enables DMA RX channel request
(DMAERQH, DMAERQL)
False
(DRF | (DBFF & RMB)) &
Token_DMA_RX & DMA_REN) ?
True
DMA Rx transfer (Req/Ack
minor/major loop) from
LINFlex regs to RAM area
False
DMA Rx transfer
done ?
True
False
False
DRF ?
True
Clear Token_DMA_RX
Clear DRF
DBFF &
RMB ?
True (extended frame,
size > 8 bytes)
Clear DBFF,RMB
(for extended frame)
Figure 27-46. FSM to control the DMA RX interface (master node)
The TCD settings (word transfer) are shown in Table 27-44. All other TCD fields are equal to 0. TCD
settings based on half-word or byte transfer are allowed.
Table 27-44. TCD settings (master node, RX mode)
TCD field
CITER[14:0]
BITER[14:0]
Value
1
1
Description
Single iteration for the “major” loop
Single iteration for the “major” loop
Freescale Semiconductor
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
27-59