75 Ring OSC Speed Test

75 : Ring OSC Speed Test

  • Author: Eric Smith
  • Description: Make two rings with the same number of stages but measure how their frequency differs. Measure if they can influence eachother.
  • GitHub repository
  • Most recent GDS build
  • HDL project
  • Extra docs
  • Clock: 6000 Hz
  • External hardware: Something to sequence nrst, ring_en, trig and the sel bits


How it works

uses a register and some combinational logic

How to test

after reset, assert trigger. Use sel bits to get result


# Input Output
0 clock out[0]
1 nreset out[1]
2 trig out[2]
3 sel[0] out[3]
4 sel[1] out[4]
5 sel[2] out[5]
6 ring_en[0] out[6]
7 ring_en[1] out[7]