inhibiting communication in ps/2 mouse

[crazy_man1234]

ps/2 mouse

hi,
I have a problem in inhibiting communication in ps/2 mouse
i am able to receive mouse bat completion code and mouse id after that i tries to inbit the communbication by bringing the clock line 0 by

assign ps2clock = (clock_enable) ? 1'b0 : 1'bz;

but when i check the waveform i find the clock is not forcing to zero

i guess even when i am writing an zero on clock line mouse is writing a 1 on clock line at thge same time.

any commeny would be appritiated.