Logic Library

Elanix, Inc.l SystemView Logic Library has three classifications of tokens:

1. Generic Tokens include well-known functions such as the NAND gate. These generic logic tokens can have an unlimited numbers of inputs. For example, you may use the NAND token to create a 2-input NAND gate, a 5-input NAND gate, etc.

2. 7400 Tokens simulate functions available as off-the-shelf parts. In SystemView, "74xx" refers to a specific logic function and not to a family such as TTL or CMOS.

3. Custom Tokens implement logic functions not generally available as off-the-shelf parts, or mixed-signal functions such as an analog switch, analog comparator, 16-bit DAC, or 16-bit ADC. Logic parameters can be independently set on each device, including logic thresholds, the amplitude and polarity of the HIGH and LOW states, and the output delay of the function. The default propagation time (output delay) is zero seconds to be consistent with the logic tokens that are in the main Operator library.

The Logic library may be used on a stand-alone basis to simulate systems such as a sequencer or digital sliding correlator, or it may be combined with the Communications, DSP, or RF/Analog libraries to enhance their capabilities. An example of this multi-library use would be the simulation of a PLL (phase-locked loop). This PLL uses the MC4044 Digital Phase/Frequency Detector and the 744040 12-stage binary counter from the Logic Library, and an Op-Amp type lowpass filter from the RF/Analog Library.

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