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
IO
# |
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] |