Programming instructions

Misc. Digital Components

Multisim Component Reference Guide 9-10 ni.com

Data selector/multiplexer truth table:

9.1.17 Digital Frequency Divider

This device is a programmable step-down divider which accepts an arbitrary divisor, a duty-

cycle term and an initial count value. The generated output is synchronized to the rising edges

of the input signal. Rise and fall delay on the outputs are independently specifiable.

9.2 VHDL

VHDL (Very High Speed Integrated Circuit (VHSIC) Hardware Description Language) is

designed to describe the behavior of complex digital devices. For this reason it is referred to

as a "behavioral level" language; it can use behavioral level models (instead of transistor/gate

level, like SPICE) to describe the behavior of these devices.

The VHDL

Family contains a number of VHDL-modeled components, including:

• Quad NAND gates

• Quad NOR gates

• Quad AND gates

• Inverters

•Buffers

• Counters

•Drivers

• MUXs

• Flip-flops

•SRAM.

Note For details on MultiVHDL , Electronic Workbench’s VHDL simulation software, refer

to the

Multisim User Guide, or the MultiVHDL 8 User Guide.

STROBE SELECT OUTPUT

A/B ABY

1 X XX1

000X1

001X0

01X01

01X10

ComponentRef.book Page 10 Thursday, December 7, 2006 10:12 AM