Sundance SMT335E - Manual (Page 20)

Version 1.5 Page 20 of 53 SMT335E SMT375E User Manual
Data rates
When using the communication links of a C6000 you must remember that the links
share a single bus, so the performance you get will depend on the way you sequence
bus accesses.
C6201 can read at 100MHz from external to internal memory; the rate for the C6701
is 83MHz. If you want to store in external memory then the rate achievable are
divided by two as the read and writes share the same bus, which means respectively
50MHz and 41MHz.
The C6000 DMA channels are not efficient when moving data between two external
memory areas sharing a common bus; the transfer will take place a word at a time
and not in more efficient bursts. This is why it may not be advisable to use DMA to
transfer data directly between external memory and a communication link.
Performance can be greatly improved by using an intermediate buffer in internal
memory.