34 UART Greeter with RNN Module :: Quicker, easier and cheaper to make your own chip!

34 : UART Greeter with RNN Module

Author: Jonathan Zentgraf

Description: Sends 'Hello' over UART and fills die space with metastability

Clock: 0 Hz

How it works

The UART transmitter is just a shift register with hardcoded initial values. The output of the shift register is fed back into itself in an infinite loop. The "RNN" is a few flip-flops feeding into each other to use up die space. :)

How to test

Testing UART is simple:

Connect the UART output to a microcontroller or scope.
Set load/enable low (load).
Set output enable high.
Set load/enable high (enable).
Observe as the string "Hello\n" is sent over UART.

The RNN module is trained on random Wokwi wiring, and might be smarter than a single human neuron. It probably detects something we mortals cannot comprehend, and is tied to inputs 0-3 and outputs 0-3. It may be fun to drive these with a very fast clock.

#	Input	Output
0	RNN input 0	RNN output 0
1	RNN input 1	RNN output 1
2	RNN input 2	RNN output 2
3	RNN input 3	RNN output 3
4
5
6	Shift register load (low) / enable (high)	UART output enabled
7	UART output enable	UART output

Input

Output

Bidirectional

RNN input 0

RNN output 0

RNN input 1

RNN output 1

RNN input 2

RNN output 2

RNN input 3

RNN output 3

Shift register load (low) / enable (high)

UART output enabled

UART output enable

UART output

Chip location

34 UART Greeter with RNN Module