Department of Electrical and Computer Engineering  
                  The University of Texas at Austin

                        ECE 382N, Spring 2002

Y. N. Patt, D. N. Armstrong
Homework 4
Due: 1 March 2002

Part  1.   The  next step  in  your  computer  design  is to  add  the
control. This is  the last assignment in which you  will be working as
an individual.  Starting with  Homework 5, you  will be  producing one
product for your group.

In this assignment, you will  specify the mechanism for generating the
control signals which  control the data path.  If  you are planning to
use  hard-wired  control,  this  means  specifying  the  finite  state
machine.  If you  are planning  to use  microprogrammed  control, this
means  specifying the microinstruction,  its fields,  the micro-orders
which make  up each  field, and the  microsequencer for  obtaining the
address of the next microinstruction.  If you are planning to pipeline
your design (highly recommended), then  it is important to provide not
only control of each  instruction through the pipeline, but sufficient
interlocks to ensure safe execution of the instruction sequence.

Hand in  hard copies  of the schematics  of the control  structure you
create.

Part  2.  Specify  all  the  control logic  (microcode  or  hardwired)
required  to completely emulate  one x86  instruction (you  choose the
instruction and  addressing modes of  the operands) from the  fetch of
the  instruction   to  the   destination  write  (i.e.,   storing  the
result). Use Verilog to simulate and verify that your design works for
that one  instruction.  Use Signalscan  to monitor important  data and
signals in the  CPU. Hand in annotated hard  copies of your signalscan
graphs. Use several pages if needed,  and make sure that the values of
all signals are readable on the printouts.'

Part 3. Hand in a block  diagram of your datapath with explanations to
clarify what the signals on the signalscan graphs refer to.