Hi,
I was asking myself, what would a dedicated external trigger add to the
project and I could not find a positive answer.
I checked a few documents for expensive LA, and it seems the only purpose
of an external trigger input is to have a dedicated BNC or similar
connector for interfacing the LA to other devices from the same vendor.
In our case one of the input signals could be used instead of a dedicated
trigger input. In any case, to properly use an external trigger, some edge
detection is necessary. This and more can be done with generic trigger
code, which is applied to all IOs.
The other question is regarding external clock. Do tools from any vendor
support external clocking for the SPI protocol, where the clock is silent
if slave select is not active. The problem is, if there is no clock, the
edge on the slave select signal can not be detected, without clock it is
also not possible to push data through input pipeline stages (before clock
domain crossing). Maybe this is not the bast example, but the question
remains, how sampling on external clock works, if this clock is not
available while the system is idle.
Regards,
Iztok Jeras
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