DMA_TCDn_BITER_ELINKNO field descriptions (continued)
Field
Description
contents of this field is reloaded into the CITER field. If the channel is configured to execute a
single service request, the initial values of BITER and CITER should be 0x0001.
13.4 Functional description
The operation of the eDMA is described in the following subsections.
13.4.1 eDMA basic data flow
The basic flow of a data transfer can be partitioned into three segments.
As shown in the following diagram, the first segment involves the channel activation:
1
eDMA Engine
Data Path
eDMA
0
Program Model/
64
Control
n-1
To/F
rom Cr
ossbar S
witch
2
Channel Arbitration
Address Path
Read Data
Write Data
Address
Read Data
Write Data
Write Address
Int
er
nal P
er
ipher
al Bus
eDMA Peripheral
Request
eDMA Done
Transfer
Control
Descriptor (TCD)
Figure 13-2. eDMA operation, part 1
Chapter 13 Enhanced Direct Memory Access (eDMA)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
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