Verilog question for first timer - number notation

Question

I'm working on my first verilog project, on an Altera DE2 board  So i'm working through some demo code/ best practices to try to do a little learning and I havnt seen this before:  
assign HEX7 = 7'h7f; 
assign GPIO_1 = 36'hzzzzzzzzz;
A &lt;= 4'b0000;
A &lt;= A + 1'b1;
  specifically the numbers. I think 1'b1 is binary 1. is the number before the ' the base and the number after the number? still seems odd to do things in base 36 and 4.  any help is greatly appreciated! thanks!

altera_forum · Answer

Ok... I think I got it. I think the number before the ' is the number of bits, and then b for binary, h for hex and then the value... the one that threw me off was the   
assign GPIO_1 = 36'hzzzzzzzzz;
  i thought hex only went up to F, so this one is still confusing me.

altera_forum · Answer

http://en.wikipedia.org/wiki/verilog also gives a good novice introduction into the verilog basics. But the best is to read a good book on verilog.

altera_forum · Answer

"z" means high impedance. "x" is also used, for "unknown/don't care".

altera_forum · Answer

Ahh thank you. I didint realize I could use the Z and X in that notation. everything is cleared up. thank you very much!

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Verilog question for first timer - number notation

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