Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Need help creating a simple 32bit counter

I'm trying to learn VHDL so I thought I'd try converting the "my_first_fpga" example from verilog to VHDL (how complicated can adding one to a number be?), three hours later, lots of googling and sea...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

in verilog you can use blocking and non blocking assignments, you can mix them but you need to decide which one you use inside an always block for this particular block

non blocking

q <= counter;

counter <= counter + 1;

is the same as if you swap the lines

counter <= counter + 1;

q <= counter;

both work the same way.

but if you use blocking assignments then it does matter in which order you write your code.

i personaly use non blocking assingments as ther are enough bugs around to catch ...