On Wed, 13 Mar 2019 13:38:43 -0700, you wrote:
On Tue, Mar 12, 2019 at 11:49 AM, Harvey White wrote:
if you regard signature analysis as fun, then you can do that.
Hi Harvey:
Thanks for the reply. There's always a few old L.A.s keeping the concrete slab down, in someone's basement... and I'm thinking about that, whenever I see one.
Logic analyzers are very useful, but somewhat limited in what they do.
They really were needed in the times of 8 and 16 bit microprocessors,
and are less useful for microcontrollers. However, since most
microcontrollers have built in debugging, you don't need to monitor
the instructions and data paths.
Monitoring the program at an assembly language level isn't as useful
as it might be when you are dealing with a compiled program.
Sometimes, however, you need to check to see what the compiler does.
The 308 has a word recognition module, and the 318/338 have word recognition modes... but, if its signature analysis... aren't captured word(s), further processed, to generate the signature? Can you do that with a 308/318/338?
Lots of logic analyzers are multiple byte wide memories with inputs
for each bit. Clocking data is either a timebase or an external
clock, so you get either a time mode/waveform display or a state mode
where only data happening at the clock is captured.
Signature mode takes a start, stop and then looks at the transitions
at a node. Those transistions are run through a shift register with
feedback, and the result is displayed in odd alphanumerics.
Not the same thing, and the data is not stored then processed in
signature mode.
308 does signature, and is a limited logic analyzer.
Don't have the other ones.
Tektronix logic analyzers and HP scopes generally drive me up a wall,
so I have tektronix scopes and HP logic analyzers.
Harvey
