UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
385 of 1269
NXP Semiconductors
UM10503
Chapter 19: LPC43xx General Purpose DMA (GPDMA) controller
In addition to the peripherals listed in
, the GPIOs, the WWDT, and the timers
can be accessed by the GPDMA as a memory-to-memory transaction with no flow control.
19.5.1 DMA request signals
The DMA request signals are used by peripherals to request a data transfer. The DMA
request signals indicate whether a single or burst transfer of data is required and whether
the transfer is the last in the data packet. The DMA available request signals are:
BREQ[15:0] —
Burst request signals. These cause a programmed burst number of data
to be transferred.
9
0x0
SSP0 receive
SSP0 receive
0x1
-
I2S0 DMA request 1
0x2
-
SCT DMA request 1
0x3
Reserved
Reserved
10
0x0
SSP0 transmit
SSP0 transmit
0x1
-
I2S0 DMA request 2
0x2
-
SCT match 0
0x3
Reserved
Reserved
11
0x0
SSP1 receive
SSP1 receive
0x1
-
SGPIO14
0x2
-
USART0 transmit
0x3
Reserved
Reserved
12
0x0
SSP1 transmit
SSP1 transmit
0x1
-
SGPIO15
0x2
-
USART0 receive
0x3
Reserved
Reserved
13
0x0
-
ADC0
0x1
Reserved
Reserved
0x2
SSP1 receive
SSP1 receive
0x3
-
USART3 receive
14
0x0
-
ADC1
0x1
Reserved
Reserved
0x2
SSP1 transmit
SSP1 transmit
0x3
-
USART3 transmit
15
0x0
-
DAC
0x1
-
SCT match 3
0x2
-
SGPIO15
0x3
-
Timer3 match 0
Table 270. Peripheral connections to the DMA controller and matching flow control signals
Peripheral
Number
DMA
muxing
option
(see
Table 46
)
SREQ
BREQ