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S3C2416X RISC MICROPROCESSOR
2.9 DMA REQUEST MODE
The PWM timer can generate a DMA request at every specific time. The timer keeps DMA request signals
(nDMA_REQ) low until the timer receives an ACK signal. When the timer receives the ACK signal, it makes the
request signal inactive. The timer, which generates the DMA request, is determined by setting DMA mode bits (in
TCFG1 register). If one of timers is configured as DMA request mode, that timer does not generate an interrupt
request. The others can generate interrupt normally.
DMA mode configuration and DMA / interrupt operation
DMA Mode
DMA Request
0000
0001
0010
0011
0100
0101
0110
PCLK
INT4tmp
DMAreq_en
nDMA_ACK
nDMA_REQ
INT4
Timer0 INT
No select
ON
Timer0
OFF
Timer1
ON
Timer2
ON
Timer3
ON
Timer4
ON
No select
ON
1 0 1
Figure 12-8. Timer4 DMA Mode Operation
Timer1 INT
Timer2 INT
ON
ON
ON
ON
OFF
ON
ON
OFF
ON
ON
ON
ON
ON
ON
PWM TIMER
Timer3 INT
Timer4 INT
ON
ON
ON
ON
ON
ON
ON
ON
OFF
ON
ON
OFF
ON
ON
12-11
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