I am currently using a PowerPMAC to control an amplifier with pulse and direction signals. My amplifier allows a maximum input frequency for pulses of 800kHz.
I set Gate3[0].PfmClockDiv to 5 in order to have a PfmClock of 3.125MHz.
I also set Gate3[0].Chan[0].PfmWidth to 5, which makes my pulses 5/3.125 = 1.6µs.
The problem is I don't know what value to set for Motor[1].MaxDac in order to limit my pulses output to 800kHz.
What I did for now is observe pulses on an oscilloscope and adjust MaxDac value so that "#1 out 100" command gives me 800Khz, #1 out 50" command gives me 400Khz etc...
I found that Motor[1].MaxDac = 10 000 fits what I want but I would like to understand where this value comes from.
MaxDac on Pfm output
in Power PMAC
Posted
Hi,
I am currently using a PowerPMAC to control an amplifier with pulse and direction signals. My amplifier allows a maximum input frequency for pulses of 800kHz.
I set Gate3[0].PfmClockDiv to 5 in order to have a PfmClock of 3.125MHz.
I also set Gate3[0].Chan[0].PfmWidth to 5, which makes my pulses 5/3.125 = 1.6µs.
The problem is I don't know what value to set for Motor[1].MaxDac in order to limit my pulses output to 800kHz.
What I did for now is observe pulses on an oscilloscope and adjust MaxDac value so that "#1 out 100" command gives me 800Khz, #1 out 50" command gives me 400Khz etc...
I found that Motor[1].MaxDac = 10 000 fits what I want but I would like to understand where this value comes from.
Best Regards,
Chafik