ENGR338 Digital Electronics 2021 Spring
Lab 7 - Using Buses in ElectricVLSI
Name: Ryan Jeanes
Using Buses in ElectricVLSI
Using buses in
ElectricVLSI provides a way to compact your schematics so that more
complex circuits are easier to parse. We show this in this lab by using
buses to create a ring-oscillator and 8-bit AND, OR, NAND,
and NOR gates using buses.
designed schematics using ElectricVLSI for the ring-oscillator and
8-bit AND, OR, NAND, and NOR gates using buses, then simulated each one
using Spice to check that they function appropriately. After simulating
them, we created the layouts for each one. The layouts weren't designed
using buses due to the output current limitations with CMOS and will
not function well with 8 TTL devices attached to the bus.
All the schematics and layouts were designed and passed DRC/NCC checks. For
the 8-bit schematics the logic gates being constructed with buses still
use single-wire arcs for the connector as ElectricVLSI wouldn't allow
the off-page bus exports to connect to the icon via bus. However, the
simulations for each circuit built confirm their functionality, so this
wasn't an issue when it came to the final layout design.