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PEAKreq = 150 MHz / [ 4 + (1 + 2) + (1 + 1) + 3 ] cycles = 12.5 Mreq/sec
Assuming an even distribution of the two transfer types, the average peak request rate
would be:
PEAKreq = (11.5 Mreq/sec + 12.5 Mreq/sec) / 2 = 12.0 Mreq/sec
The minimum number of cycles to perform a single read/write, zero wait states on the
system bus, from a cold start where no channel is executing and eDMA is idle are:
• 11 cycles for a software, that is, a TCDn_CSR[START] bit, request
• 12 cycles for a hardware, that is, an eDMA peripheral request signal, request
Two cycles account for the arbitration pipeline and one extra cycle on the hardware
request resulting from the internal registering of the eDMA peripheral request signals.
For the peak request rate calculations above, the arbitration and request registering is
absorbed in or overlaps the previous executing channel.
When channel linking or scatter/gather is enabled, a two cycle
delay is imposed on the next channel selection and startup. This
allows the link channel or the scatter/gather channel to be
eligible and considered in the arbitration pool for next channel
selection.
23.5 Initialization/application information
The following sections discuss initialization of the eDMA and programming
considerations.
23.5.1 eDMA initialization
To initialize the eDMA:
1. Write to the CR if a configuration other than the default is desired.
2. Write the channel priority levels to the DCHPRIn registers if a configuration other
than the default is desired.
3. Enable error interrupts in the EEI register if so desired.
4. Write the 32-byte TCD for each channel that may request service.
Freescale Semiconductor, Inc.
Note
KV4x Reference Manual, Rev. 2, 02/2015
Preliminary
Chapter 23 Direct Memory Access Controller (eDMA)
435
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