39 Redco
39 : Redco
- Author: Shrikrishna Kaje
- Description: Reconfigurable DCO
- GitHub repository
- View in Wokwi
- Clock: 0 Hz
How it works
This design is targetted to be used as
- Ring oscillator
- Clock divider
- Digitally controlled oscillator
Basically it is a ring oscillator which is connected clock divider ckt. The clock divider can be muxed out for different frequencies
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Ring oscillator Five inverters are used in chain. By shorting out0 pin to in0 and in4, the design can be configured as a ring oscillator Frequency = 1/(5*inverter cell delay)
-
Clock divider network Dff chain is used to introduce clock division. By using combination between s0(in1), s1(in2) , s2(in3) below we can different division at out1 fs - frequency of the clock signal
How to test
Pin description
- clk (in4) - clock input, input the clock signal to this pin if the chip is to be used as a clock divider, out1 is the output of the clock divider. Short it to in0 and out0 if used as a Oscillator
- in(in0) - Short it with clk pin and out0 if used as a ring oscillator
- s0(in1) - LSB of the binary input (DCO input or clock divider select)
- s1(in2) - second binary input (DCO input or clock divider select)
- s2(in3) - MSB of the binary input (DCO input or clock divider select )
- out0 - ring oscillator output
- out1 - clock divider and DCO
External hardware
List external hardware used in your project (e.g. PMOD, LED display, etc), if any
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | in | out0 | |
| 1 | s0 | out1 | |
| 2 | s1 | ||
| 3 | s2 | ||
| 4 | clk | ||
| 5 | |||
| 6 | |||
| 7 |