PXS20RM Datasheet, PDF (1032/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

LIN Controller (LINFlexD)
Enables DMA TX
channel request
(DMAERQH, DMAERQL)
!DTF &
!DRF & (LIN idle |
DBEF) & DMA_TEN &
!Token_DMA_RX
?
True
False
DMA TX transfer (Req/Ack
minor/major loop) from
RAM area to LINFlex registers
DMA TX
transfer is completed
?
True
False
DBEF
?
False
Set HTRQ to transmit the
LIN frame (header + [data])
True
Clear DBEF to transmit the LIN
frame (data for extended frame)
True (RX mode)
Set Token_DMA_RX to enable
the DMA RX interface
!DIR & !DDRQ
?
False (TX mode)
DTF
False
?
True (end of frame)
DBEF
?
False
Clear DTF
True
(extended frame,
size > 8 bytes)
Figure 31-44. FSM to control the DMA TX interface (master node)
The TCD settings (word transfer) are shown in Table 31-42. All other TCD fields are equal to 0. TCD
settings based on half-word or byte transfers are allowed.
31-56
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor