Analog Devices adsp-2100 Manual page 277

11 DMA Ports
• SPORT Autobuffering to External Memory with Waitstated Access –
When one of the processor's serial ports needs to access external
memory for autobuffering and the external access takes more than one
cycle, the IDMA transfer will be held off.
• EZ-ICE Emulation – When the EZ-ICE emulator is controlling your
ADSP-2181 target system, IDMA transfers may be held off for periods
of time.
Using the
ignore hold-off conditions. If you always wait for
accessing the IDMA port, the DMA transfers will always operate properly.
You can ignore
system or if your IDMA accesses are longer than any hold-offs. To be sure of
this, you must carefully analyze all possible hold-off conditions of your
system.
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IACK
signal simplifies your system design by allowing you to
IACK
, however, if you are sure that no hold-offs occur in your
IACK
to assert before