720 IHP VGA demo
720 : IHP VGA demo
- Author: algofoogle (Anton Maurovic)
- Description: Simple VGA demo for IHP tapeout (inc. Matt Venn's VGA clock)
- GitHub repository
- Open in 3D viewer
- Clock: 25000000 Hz
How it works
Typical Verilog design that generates VGA timing and RGB222 colour outputs compatible with the Tiny VGA PMOD.
It produces a bouncing ball animation over the top of an adaptation of Matt Venn's VGA clock, from here: https://github.com/mattvenn/tt08-vga-clock
How to test
- Plug in a VGA monitor via Tiny VGA PMOD.
- Set
modeinput to 0, i.e. specifying 640x480 60Hz from a 25MHz clock. - Set
show_clockinput to 1. - Set
pmod_selectinput to 0 for Tiny VGA PMOD. Otherwise, 1=Matt's VGA Clock PMOD. - Supply a 25MHz clock (clock's actual seconds timer assumes exactly 25.000MHz).
- Assert reset.
- Pulse or hold the
adj_*inputs to adjust hours, minutes, or seconds.
External hardware
Tiny VGA PMOD and VGA monitor is all you should need externally.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | adj_hrs | r1 | hmax |
| 1 | adj_min | g1 | vmax |
| 2 | adj_sec | b1 | hblank |
| 3 | vsync | vblank | |
| 4 | r0 | visible | |
| 5 | g0 | ||
| 6 | b0 | ||
| 7 | mode | hsync |