UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
391 of 1269
NXP Semiconductors
UM10503
Chapter 19: LPC43xx General Purpose DMA (GPDMA) controller
19.6.8 DMA Enabled Channel Register
The ENBLDCHNS Register is read-only and indicates which DMA channels are enabled,
as indicated by the Enable bit in the CCONFIG Register. A HIGH bit indicates that a DMA
channel is enabled. A bit is cleared on completion of the DMA transfer.
19.6.9 DMA Software Burst Request Register
The SOFTBREQ Register is read/write and enables DMA burst requests to be generated
by software. A DMA request can be generated for each source by writing a 1 to the
corresponding register bit. A register bit is cleared when the transaction has completed.
Reading the register indicates which sources are requesting DMA burst transfers. A
request can be generated from either a peripheral or the software request register. Each
bit is cleared when the related transaction has completed.
Note:
It is recommended that software and hardware peripheral requests are not used at
the same time.
19.6.10 DMA Software Single Request Register
The SOFTSREQ Register is read/write and enables DMA single transfer requests to be
generated by software. A DMA request can be generated for each source by writing a 1 to
the corresponding register bit. A register bit is cleared when the transaction has
completed. Reading the register indicates which sources are requesting single DMA
transfers. A request can be generated from either a peripheral or the software request
register.
Table 279. DMA Enabled Channel Register (ENBLDCHNS, address 0x4000 201C) bit
description
Bit
Symbol
Description
Reset
value
Access
7:0
ENABLEDCHANNELS
Enable status for DMA channels. Each bit
represents one channel:
0 - DMA channel is disabled.
1 - DMA channel is enabled.
0x00
RO
31:8
-
Reserved. Read undefined.
-
-
Table 280. DMA Software Burst Request Register (SOFTBREQ, address 0x4000 2020) bit
description
Bit
Symbol
Description
Reset
value
Access
15:0
SOFTBREQ Software burst request flags for each of 16 possible
sources. Each bit represents one DMA request line or
peripheral function (refer to
for peripheral
hardware connections to the DMA controller):
0 - writing 0 has no effect.
1 - writing 1 generates a DMA burst request for the
corresponding request line.
0x00
R/W
31:16
-
Reserved. Read undefined. Write reserved bits as zero.
-
-