Verilog采用的四值逻辑系统 buf 0, Low, False, Logic Low, Ground, Vss Negative Assertion buf 1, High, True, Logic High, Power, VDD. VCC. Positive Assertion buf x, X Unknown: Occurs at Logical Which Cannot be Resolved Conflict bufif1 'z. HiZ, High Impedance, Tri-Stated, Disabled Driver(Unknown)Verilog采用的四值逻辑系统 ’0’, Low, False, Logic Low, Ground,VSS, Negative Assertion ‘1’, High, True, Logic High, Power, VDD, VCC, Positive Assertion ’X’ Unknown: Occurs at Logical Which Cannot be Resolved Conflict HiZ, High Impedance, Tri- Stated, Disabled Driver (Unknown)