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Altera_Forum's avatar
Altera_Forum
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15 years ago

a new user,a strange question

Warning: Output pin "pre_syn.bp.PidCtrlA_Phase_i_2_" driven by bidirectional pin "LVTTLIO_D2[11]" cannot be tri-stated who can tell me what is the mean of this?????.the"Phase_i" is register,and"LV...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Sounds like you are trying to drive a tristate ('Z') level to an output pin. To do so, the pin must be defined as inout instead of out.