[SOLVED] using all conditions in if else statement

[syedshan]

Dear all,

Hope every member of the forum is in best of health and peace

I was wondering that using all possible cases in if-else is necessary to avoid any parasitic latch. But When we have no other condition but to retain the value then what
to do since I think it will also cause the parasitic latch to occur...Please see the following code

reg [x:0] address;
always@(posedge clk)
if(rst) address <= 10'd0;
else 
if(m_en)
address <= address + 1'b1;
else address <= address;

In this case. since address is itself a reg, hence I understand no need to place the 'address <= address' with else but what else should I do so that I can avoid hidden latch.
Also what difference that latch can create...

Many thanks and Regards,
Shan

 

[manojkhandelwal]

Hi,

reg is the only legal type on the left-hand side of an always block,and hence address should be of type reg

Please make this point clear in your mind

"Just making (address) or for that matter any net of type reg DOESENT mean that it will infer a register"


Also,avoid inferring latches when you want to implement some combinational logic inside always block...doesent mean you need to have all possible conditions for sequential always block.

Thanks,
Manoj

 

[syedshan]

Thanks...

A misconception I had , mixed combinational and sequential block's concepts