Maximum step rate with MESA
01 Nov 2024 05:17 #313572
by rajsekhar
Maximum step rate with MESA was created by rajsekhar
I want to know how to calculate the maximum step frequency with MESA card.
What are the input datas required..maximum servo period..and??
What are the input datas required..maximum servo period..and??
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- besriworld
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01 Nov 2024 06:14 #313573
by besriworld
Replied by besriworld on topic Maximum step rate with MESA
Surely a mesa card can make the frequency that the servo driver can accept.
I read that it can do up to 8mhz
If the driver allows go to quadrature step type
step_type = 2
I read that it can do up to 8mhz
If the driver allows go to quadrature step type
step_type = 2
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01 Nov 2024 07:24 #313578
by rajsekhar
Replied by rajsekhar on topic Maximum step rate with MESA
Basically I understand that Mesa FPGA cards can do upto few MHz.
But there is constrain in terms of computer latency and network latency. There may be others also, I am not aware.
I want to know those and decide what is the bottle neck value of step pulse rate that I can use?
But there is constrain in terms of computer latency and network latency. There may be others also, I am not aware.
I want to know those and decide what is the bottle neck value of step pulse rate that I can use?
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- tommylight
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01 Nov 2024 07:33 #313582
by tommylight
Replied by tommylight on topic Maximum step rate with MESA
Network latency is a Linux driver issue, it is NOT a LinuxCNC nor Mesa issue.
Computer latency is hardware issue, again NOT a LinuxCNC nor Mesa issue.
There is no bottleneck, your hardware will give up way before Mesa or LinuxCNC does, granted you do not have a 60000RPM spindle with over 2000PPR encoder, as that is 8MHz.
Still, i know some Mesa boards can do 10Mhz, so that is 2500PPR on 60000RPM.
Computer latency is hardware issue, again NOT a LinuxCNC nor Mesa issue.
There is no bottleneck, your hardware will give up way before Mesa or LinuxCNC does, granted you do not have a 60000RPM spindle with over 2000PPR encoder, as that is 8MHz.
Still, i know some Mesa boards can do 10Mhz, so that is 2500PPR on 60000RPM.
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01 Nov 2024 18:30 #313613
by PCW
Replied by PCW on topic Maximum step rate with MESA
Yes, the maximum steprate for Mesa FPGA cards is only dependent
on the hardware. It is independent of the host controller.
This is because the steprate is set by a digital oscillator.
The host does determine the update rate of the steprate,
so even though you could have a 10 MHz steprate at a 1 Hz
update rate it would not work at any reasonable acceleration rate.
on the hardware. It is independent of the host controller.
This is because the steprate is set by a digital oscillator.
The host does determine the update rate of the steprate,
so even though you could have a 10 MHz steprate at a 1 Hz
update rate it would not work at any reasonable acceleration rate.
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