221 MicroASIC VI
221 : MicroASIC VI
- Author: Mikhail Svarichevsky
- Description: Free-running oscillators to verify simulation vs reality + TRNG
- GitHub repository
- Clock: 1000 Hz
How it works
Combinational loops with dividers to bring output frequency to <50kHz range
How to test
Select oscillator (pins 4-6) and mesaure frequency on one of output pins. Observe true random numbers at pin 7.
External hardware
You might benefit from frequency counter than can do averaging across extended period of time.
IO
| # | Input | Output |
|---|---|---|
| 0 | clock in (for debugging) | clock divided by 2^10 |
| 1 | reset | clock divided by 2^14 |
| 2 | shift register clk | clock divided by 2^18 |
| 3 | shift register data | clock divided by 2^22 |
| 4 | clock source id_0 | clock divided by 2^26 |
| 5 | clock source id_1 | clock divided by 2^30 |
| 6 | clock source id_2 | clock divided by 2^32 |
| 7 | Bit 11 of shift register (to ensure it's not optimized away) |