University of Florida EEL 3701— Fall 2002 Dr. Eric M. Schwartz
Department of Electrical & Computer Engineering Professor in ECE
Page 2/2 Revision 4 3-Dec-02—7:23 PM
LAB 9: G-CPU: Assembly Programming and Hand Assembly
PART II. NEW PROGRAM CREATION (Prelab)
1. Write a program to take the average of a set of two
numbers. The input table is arranged as following:
OutAddr, TabSize, Num1a, Num2a, Num1b, Num2b, …
You will create an output table with the average of
each set of two numbers. The output table starts with
the average of the Num1a and Num2a from the input
table followed by the average of Num1b and Numb2b
from the input table, etc. OutAddr is the starting
address of the output table. TabSize is the number of
averages your program will execute. When you have
completed the data processing, execute an endless
loop (like a dog chasing its tail).
2. Assume that the input table and the output table are
both in SRAM. The input table begins at address
$1200. To test your program, you will have to create
some data in an SRAM (.mif) file as well as store your
program in a ROM (eprom.mif) file.
3. Use the X register to point to the data that is read
from the input table and use the Y register to point to
the output table.
4. REG A should be used as a loop counter. REG B
should be used for calculations. (Hint: You may need
to temporarily store the loop counter in memory, i.e.,
SRAM, while REG A is used for other purposes.)
5. Verify the program works by creating an sram.mif. For
this verification, use OutAdd = $1400, TabSize = 4,
and use at least four data bytes. Print the simulation
results and annotate it with the instructions.
6. Bring your assembly code, hand assembled machine
code and simulation results to lab.
Note: If you wish to use variables or store values in your
code, you must reference the RAM area of you memory
space. RAM is located in $1000 - $1FFF. ROM is read
only.
Note: When you change data in either the eprom.mif file
or the sram.mif file, you must recompile the computer.gdf
file.
IN-LAB REQUIREMENTS
1. Show your TA the pre-lab work associated with Part I.
results. Your TA will ask you general questions on
the operation of the code in simulation.
2. Show your TA the pre-lab work associated with Part
II. results. Your TA will again ask you general
questions on the operation of the code in simulation.
3. Your TA will give you another input table with which
to test your algorithm from Part II.
4. The TA will now ask you to write a short program
(very simple task). Create and simulate the desired
program.
