xzsawq21
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Posts posted by xzsawq21
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13 hours ago, zygot said:
Perhaps I don't understand what you are implying. Do you want to create a clock less than 12 MHz?
BTW, the CMOD-A7 has a number of clock capable GPIO pins so really you can use any external clock frequency your heart desires by connecting a 3.3V IOSTANDARD compatible clock source to one of the appropriate pins..
As for measuring a pulse width, the higher the clock that the logic runs at the higher the resolution of the measurement that you can make. The same is true for generating pulses.
I want to control a stepper motor, in my application, I capture a pulse signal from a source (consider 40KHz) then I should generate a 30Hz or 50Hz pulse signal.
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3 hours ago, reddish said:
The crystal provided is 12 MHz, as you say.
While this is out of spec for the FPGA's PLLs (F_IN range: 19 to 800 MHz), it is within spec for the MMCMs (F_IN range: 10 to 800 MHz). I have successfully generated fast clocks (> 100 Mhz) on the CMOD modules using the provided crystal, without any issue.
See Xilinx DS181, tables 37 and 38.Dear
Actually in my application, I measure the frequency of a pulse (the pulse is the output of an encoder), for example 40kHz then I should generate a 150Hz or a 200Hz pulse. Thanks
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Hello
I want to buy a CMOD-A7 35t board. how much is the crystal frequency on the board? 12MHz? if so can I upgrade it? (I want to use the PLL), I checked the schematic and I only see a 100MHz crystal.
Thanks
CMOD-A7 35t crystal frequency
in FPGA
Posted · Edited by xzsawq21
I have a stepper motor driver that generates suitable pulses for a stepper motor, but this driver wants an input clock. I generate the clock with a FPGA. the frequency of the clock determines the speed of the stepper motor.
in my application I capture a pulse signal from a source (consider 40KHz) then I should generate a 30Hz or 50Hz or 100Hz pulse signal to control the speed of the stepper motor.