165 Giant Ring Oscillator (3853 inverters)

165 : Giant Ring Oscillator (3853 inverters)

Design render

How it works

A giant, configurable ring oscillator with up to 3853 stages. To enable the ring oscillator, connect one of the output pins to the first input pin (ring_in / ui_in[0]). Each output pin is connected at a different point in the ring oscillator chain, making it possible to create rings of different lengths:

Pin Chain length
uo[0] 1
uo[1] 3
uo[2] 5
uo[3] 7
uo[4] 11
uo[5] 21
uo[6] 51
uo[7] 101
uio[0] 201
uio[1] 501
uio[2] 1001
uio[3] 2001
uio[4] 3001
uio[5] 3853

How to test

Connect one of the output pins (e.g. uio_out[5]) to ring_in, and measure the output frequency.

External hardware

A scope / logic analyzer to measure the output frequency and the delay between different points in the inverter chain.

IO

#InputOutputBidirectional
0ring_inlen1len201
1len3len501
2len5len1001
3len7len2001
4len11len3001
5len21len3853
6len51
7len101

Chip location

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