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IEEE 1164 Library

    For compatibility with Xilinx FPGA in the hardware labs, we will use the IEEE 1164 library, and in particular the STD $\underline\$LOGIC and STD $\underline\$LOGIC $\underline\$VECTOR data types for our input/output signals.

STD $\underline\$LOGIC is a subtype of STD $\underline\$ULOGIC, and has the following logic values:

Logic value	State	Strength
U	Uninitialized	-
X	Unknown	Forcing
0	0	Forcing
1	1	Forcing
Z	-	High Impedance

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