about EPM240 high impedance output

wont't you need some termination resistor between A and B ? like 150Ohm or something matching to your cable ?

no neet a termination resistor, cause its just p2p.

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the waveform are right.......... the wrong waveform show as the red lines the attachment with the operation.

assign aup=adjlevel?1'b0:1'bz;

assign bdown=adjlevel?1'b1:1'bz;

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i think its about the IO resource configuration of MAXII device ,.......

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thanks a lots