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Libraries Guide
Chapter 10: Design Elements (SOP3 to XORCY_L)

WOR2AND

2-Input OR Gate with Wired-AND Open-Drain Buffer Output

XC3000
XC4000E
XC4000X
XC5200
XC9000
Spartan
SpartanXL
Spartan2
Virtex
N/A
Primitive
Primitive
N/A
N/A
N/A
N/A
N/A
N/A

WOR2AND is a 2-input (I1 and I2) OR gate/buffer with an open-drain output (O). It is used in bus applications by tying multiple open-drain outputs together. When both inputs (I1 and I2) are Low, the output (O) is Low. When either input is High, the output is off; WOR2AND cannot source or sink current. To establish an output High level, tie a pull-up resistor(s) to the output (O). One pull-up resistor uses the least power, two pull-up resistors achieve the fastest Low-to-High speed.

To indicate two pull-up resistors, append a DOUBLE parameter to the pull-up symbol attached to the output (O) node. Refer to the appropriate CAE tool interface user guide for details.