info.md

How it works

The factory test module is a simple module that can be used to test all the I/O pins of the ASIC.

It has three modes of operation:

1. Mirroring the input pins to the output pins (when rst_n is low).
2. Mirroring the bidirectional pins to the output pins (when rst_n is high sel is low).
3. Outputing a counter on the output pins and the bidirectional pins (when rst_n is high and sel is high).

The following table summarizes the modes:

rst_n	sel	Mode	uo_out value	uio pins
0	X	Input mirror	ui_in	High-Z
1	0	Bidirectional mirror	uio_in	High-Z
1	1	Counter	counter	counter

The counter is an 8-bit counter that increments on every clock cycle, and resets when rst_n is low.

How to test

1. Set rst_n low and observe that the input pins (ui_in) are output on the output pins (uo_out).
2. Set rst_n high and sel low and observe that the bidirectional pins (uio_in) are output on the output pins (uo_out).
3. Set sel high and observe that the counter is output on both the output pins (uo_out) and the bidirectional pins (uio).