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Table 22-1. eDMA engine submodules (continued)
Submodule Function
the new values for the TCD n _{SADDR, DADDR, CITER} back to local memory. If the major
iteration count is exhausted, additional processing is performed, including the final address pointer
updates, reloading the TCD
n _CITER field, and a possible fetch of the next TCD n from memory as
part of a scatter/gather operation.
Data path This block implements the bus master read/write datapath. It includes a data buffer and the
necessary multiplex logic to support any required data alignment. The internal read data bus is the
primary input, and the internal write data bus is the primary output.
The address and data path modules directly support the 2-stage pipelined internal bus. The
address path module represents the 1st stage of the bus pipeline (address phase), while the data
path module implements the 2nd stage of the pipeline (data phase).
Program model/channel
arbitration This block implements the first section of the eDMA programming model as well as the channel
arbitration logic. The programming model registers are connected to the internal peripheral bus.
The eDMA peripheral request inputs and interrupt request outputs are also connected to this block
(via control logic).
Control This block provides all the control functions for the eDMA engine. For data transfers where the
source and destination sizes are equal, the eDMA engine performs a series of source read/
destination write operations until the number of bytes specified in the minor loop byte count has
moved. For descriptors where the sizes are not equal, multiple accesses of the smaller size data
are required for each reference of the larger size. As an example, if the source size references 16-
bit data and the destination is 32-bit data, two reads are performed, then one 32-bit write.
The transfer-control descriptor local memory is further partitioned into:
Table 22-2. Transfer control descriptor memory
Submodule Description
Memory controller This logic implements the required dual-ported controller, managing accesses from the eDMA
engine as well as references from the internal peripheral bus. As noted earlier, in the event of
simultaneous accesses, the eDMA engine is given priority and the peripheral transaction is
stalled.
Memory array TCD storage for each channel's transfer profile.
22.1.3 Features
The eDMA is a highly programmable data-transfer engine optimized to minimize any
required intervention from the host processor. It is intended for use in applications where
the data size to be transferred is statically known and not defined within the transferred
data itself. The eDMA module features:
• All data movement via dual-address transfers: read from source, write to destination
• Programmable source and destination addresses and transfer size
• Support for enhanced addressing modes
Chapter 22 Enhanced Direct Memory Access (eDMA)
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 427