997 TinyCore8
997 : TinyCore8
- Author: Catalin Lazar
- Description: An 8-bit programmable CPU with serial program loading for Tiny Tapeout SKY130.
- GitHub repository
- Open in 3D viewer
- Clock: 10000000 Hz
TinyCore8
TinyCore8 is a minimal 8-bit programmable CPU implemented in Verilog for Tiny Tapeout SKY130.
How it works
TinyCore8 has eight 8-bit registers, a 4-bit program counter, a small program memory, and a simple accumulator-style instruction set.
Programs are loaded serially through the input pins using load_clk, load_data, and load_enable. After loading, asserting run starts execution.
The CPU can load immediates, move data, perform simple ALU operations, branch, read a 4-bit external input, and write an 8-bit output port. The output port is connected to uo_out[7:0].
How to test
A simple smoke-test program is:
LDI R0, 0xA5
OUT R0
HALTIO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | load_clk | out0 | |
| 1 | load_data | out1 | |
| 2 | load_enable | out2 | |
| 3 | run | out3 | |
| 4 | in0 | out4 | |
| 5 | in1 | out5 | |
| 6 | in2 | out6 | |
| 7 | in3 | out7 |