CompE-475 Microprocessors
Spring 2004 Design Project
Objective
Design a single board computer for a more-or-less complete 8086/80C186XL-based
system containing at least 128k x 8 bytes of SRAM using 8-bit wide SRAM chips of your
own choice, at least 64k of EEPROM, and at least one Intel 82C55A-2 PIO unit
connected to the lower data bus through a tri-state transceiver designed in a
CPLD/FPGA.
In addition, your design must include an arbitrary logic function that provides
external signals that perform a useful external operation of your own specification. Some
possible choices are
• 8259 Priority Interrupt Controller
• LED/LCD display driver circuit,
• Counter,
• Character generator,
• Stepper Motor Controller
• Big-Screen Neon Sign Display
• Interface with Keyboard and Display
• RS-233 programmable parallel I/O port
• Polled DTMF Command Decoder
• Interrupt Driven DTMF Decoder
• Remote numeric pad decoder
• Musical Keyboard sampler
• Electronic Car Alarm
• Multi-function Remote Control
and any other based on a student’s interest.
The key assignment problem is to provide a complete interface that includes all
circuitry necessary to cause your 8-bit SRAM to appear as a 16-bit fully double banked
SRAM to the 8086/8OC186XL. This will require that you to provide an 8-bit to 16-bit
trans-multiplexer function in your PLD device. Your logic design may or may not fit
inside the smaller MAX7032 type CPLD so you will probably need to consider a larger
and faster Altera CPLD/FPGA. A generally guideline is to use design parts that are
available in the Mentor Graphics SmartmodelTM Library.
Report Format
Submit a written report that will include the following:
1. (10 pts) Write a design specification for your design that describes
1. What your system will do (e.g. a single board computer with display driver and
keyboard circuit),
2. How and why you selected certain parts, including part speed grades, pad sizes,
