File name

HiZ_bidirect_1bit.nsl

Function

Example code of bidirectional signal with high impedance control.

Signal description

This code shown bidirectional signal control example.
A bidirection lines are declared as ‘PortA’ and ‘PortB’.

At ‘DIR’ signal is ‘L’ and ‘OEN’ is ‘H’, a value of ‘PortB’ is transfered to ‘PortA’.
At ‘DIR’ signal is ‘H’ and ‘OEN’ is ‘H’, a value of ‘PortA’ is transfered to ‘PortB’.

Also, ‘OEN’ signal is ‘L’, ‘PortA’ and ‘PortB’ signals will be ‘Hi-Z’ status.

DIR	OEN	PortA	PortB
L	H	HiZ	PortA
H	H	PortB	HiZ
X	L	HiZ	HiZ

Note

This function is same an one part of 74245 – TTL standard logic -.