Chapter 20
Direct Memory Access Multiplexer (DMAMUX)
20.1 Chip-specific DMAMUX information
20.1.1 DMA MUX Request Sources
This device includes a DMA request mux that allows up to 63 DMA request signals to be
mapped to any of the 4 DMA channels. Because of the mux there is no hard correlation
between any of the DMA request sources and a specific DMA channel. Some of the
modules support Asynchronous DMA operation as indicated by the last column in the
following DMA source assignment table.
Source
number
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Freescale Semiconductor, Inc.
Table 20-1. DMA request sources - MUX 0
Source module
—
Reserved
LPUART0
LPUART0
LPUART1
LPUART1
UART2
UART2
Reserved
Reserved
Flex_IO
Flex_IO
Flex_IO
Flex_IO
2
I
S0
Table continues on the next page...
KL27 Sub-Family Reference Manual , Rev. 5, 01/2016
Source description
1
Channel disabled
Not used
Receive
Transmit
Receive
Transmit
Receive
Transmit
—
—
FlexIO_Ch0
FlexIO_Ch1
FlexIO_Ch2
FlexIO_Ch3
Receive
Async DMA
capable
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
293