34 lines
844 B
Coq
34 lines
844 B
Coq
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/*
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* This should produce x StL x StL
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*
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* When using both nmos and pmos you get the correct
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* result if only one of the control signals is X, but
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* when used individually you get StX not StL. This
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* appears to be a vec4 vs vec8 problem. R versions
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* give similar results.
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*
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* If both control inputs are X and the input is 0 the
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* value is calculated incorrectly.
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*/
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module top;
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reg nctl, pctl, b;
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wire c, d;
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initial begin
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$display("These should all produce:\nx StL x StL\n-----------");
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$monitor("c=%b(%v), d=%b(%v), b=%b, nctl=%b, pctl=%b", c, c, d, d, b, nctl, pctl);
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b = 0;
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nctl = 0;
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pctl = 1'bx;
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#1 nctl = 1'bx;
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#1 b = 1;
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end
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nmos n1 (c, b, nctl);
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pmos p1 (c, b, pctl);
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pmos p2 (d, b, pctl);
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// bufif1 n1 (c, b, nctl);
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// bufif0 p1 (c, b, pctl);
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// bufif0 p2 (d, b, pctl);
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endmodule
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