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Verilog assign ternary operator

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verilog assign ternary operator

Conditional Operator

Basic Definition

The particular conditional agent selects the appearance for the purpose of analysis based about any valuation in condition.

Shortened Syntax

state ? expression1 : expression2;

Description

Any time all the illness is definitely re-evaluated while fake (or 0 % value) then simply expression2 is normally examined along with put to use mainly because an important consequence from a entire appearance.

Verilog Common Tutorial

In the event that predicament will be considered when verilog give ternary operator (or non-zero value) then simply expression1 is actually re-evaluated. Through court case illness can be looked at for the reason that x or perhaps z . appeal, then simply at the same time expresion1 together with expression2 tend to be examined, together with this end can be considered piece from little upon the particular foundation with the right after table:

 

0

1

x

z

0

0

x

x

x

1

x

1

x

x

x

x

x

x

x

z

x

x

x

x

Table 5 Outcome involving little by just tid bit calculation.

In cases where just one for that movement is without a doubt involving true kind in that case your direct result connected with all the overall phrase should really get 0 (zero).

In case movement have various plans, then distance from a particular whole saying should become extensive to help you all the amount of time for a more time appearance. Trailing 0s definitely will possibly be applied to help you a in frosty blood vessels aspect 4 expression.

Any conditional agent will be nested (Example 3) together with the behavior is actually the identical using your scenario declaration behavior.

Examples

Situation 1

(a) ?

Your Answer

4'b110x : 4'b1000;

Should 'a' comes with a new non-zero significance and then your effect about this kind of term is definitely 4'b110x. If perhaps 'a' is usually 0, therefore your consequence of this approach expression might be 4'b1000.

In the event 'a' is without a doubt x benefit after that all the direct result is normally 4'b1x0x (this might be owing to help you any actuality which will that effect should end up being computed bit from little bit on any groundwork in typically the Platform 1).

Occasion 2

assign data_out = (enable) ?

data_reg : 8'bz;

This earlier mentioned instance indicates modeling tri-state buffers.

Instance 3

reg [4:0] mux;
reg [1:0] addr;
mux = (addr == 2'b00) ? i0 :
  napoleon command composition papers == 2'b01) ?

FPGA Central

i1 :
  ((addr == 2'b10) ? i2 :
  ((addr == 2'b11) ? i3 :
  4'bz)));
case (addr)
  2'b00: mux = i0;
  ap books thesis examples mux = i1;
  2'b10: mux = i2;
  2'b11: mux = i3;
  default: mux = 4'bz;
endcase

Couple of various approaches in modeling some sort of multiplexer.

Fundamental Notes

  • Conditional operator can often be employed for tri-state barrier modeling.

  • Conditional driver can certainly come to be nested (its habit will be equivalent with the help of typically the lawsuit assertion behavior).

 

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