File name

CNT8_instance.nsl

Function

8bit synchronouse counter circuit.
– Asynchronous reset.
– Carry input
– Initial value load
– Count enable
– Carry output

I/O signal

PARAM_in[8]=Initial value.
LOAD_in=Load request.
ENB_in=Count enable.
Q_out[8]=Data output.

Specification

This code shown example of hierarcy module design using ‘#include’ syntax.

It contain two 4bit synchronous counter function to build a 8bit synchronous counter.
A ‘#include’ syntax concatenate 4bit counter function as lower module and a top module provide data pins and control signals.
This operation style is called an ‘Instanciate’.

Note

See more information in ‘CNT4.nsl’ source code.