PXD20RM Datasheet, PDF (1366/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

Figure 39-38. PCM Sample Flow for Wave mode
Memory system (RAM, flash)
Wave 0
eDMA TCDx start address
Wave 1
Wave 2
eDMA TCDy start address
eDMA Transfer
eDMA Transfer
FIFO0
FIFO1
FIFO2
FIFO3
CH0
CH1
CH2
CH3
The SGM makes a DMA request to the associated channel
when the FIFO falls below the watermark level
Mixer
39.7.1.1 State Machine of SGM channel in Wave mode
The SGM manages the operation of the channel using a state machine. The current state of the machine
for each channel is found in the SGMST register. See Figure and Table 39-40 for details of the state
machine operation.
A
IDLE/STOP
E
PLAYB
B
D
C
DEADT
Figure 39-39. Wave mode State Machine - by Function
Source State
IDLE/STOP
Table 39-40. Wave mode State Machine
Destination State
PLAYB
Transfer
Condition
Description
A
If SOG is asserted, samples will fetched from
FIFO and the playback starts.
39-42
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor