I have four TTL level signals that must change state in a particular order.
From the “go” signal on one of the lines, all toggling of the other lines will be done within 100 us. The other three signals will toggle at most a couple of times. The start, end and duration between state change that these other three signals will toggle varies depending upon metrics in the system that are know well before the go signal occurs. But the timing is variable so the sequence of pulses and their durations need to be programmable. The timing and duration is known before the sequence starts.
Here’s the rub, I need sub microsecond jitter accuracy. The 120 MHz ARM micro I’m using can’t guarantee such deterministic timing profiles due to pipelining and a host of other performance enhancing reasons. We can do our best to architect the system to minimize the jitter but I want to know if it’s use a faster micro or DSPs or CPLD, PALs, etc. are a typical way to get the accuracy and resolution I’m looking for.
In the past with an 8 bit micro running at 8 MHz with one instruction per clock cycle I could write some assembler, put the micro to sleep, wake on interrupt, count some clock cycles and have 0.25 us accuracy
What technology to I need to investigate to achieve this resolution and accuracy?