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how can i detect X value

Hello, i'm using ticks to read data from verilog wire. however, when the wire contains invalid value (x) it gives me defauls zero. how can detect this invalid value ? thanks,

Originally posted in cdnusers.org by zcabeli11

archive over 17 years ago

Use ports instead - they're faster, safer and have built-in methods for doing X checks etc.

Originally posted in cdnusers.org by stephenh
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archive over 17 years ago

i used simple port to bind a name with it's verilog corresponding element. and then called the method has_unknown( )

thanks,

Originally posted in cdnusers.org by zcabeli11
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archive over 17 years ago

You can also use the MVL API with simple ports to both sample and drive X/Z values safely.

Originally posted in cdnusers.org by jhzhang
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archive over 17 years ago

The following example gives the x detection on simple port

a : simple_port of bit is instance;

if(a.get_mvl() == MVL_X) {
out("unknown value was detected on verilog wire");
};

Originally posted in cdnusers.org by arjuny
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