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Project 3
Sequential Chips

Grading
(A) Project Demo [70%]: + Bonus Chip will be announced later
You will be graded for correctness of the chips (hdl) you have designed and coded. So,
make sure to test and verify your codes before finally submitting on eCampus.
Rubric: Each circuit needs to pass all its test cases to get the points, else you will receive a
0 on that circuit.
(B) Lab Quiz [30%]: Friday, Oct 25
th Labs
The questions can involve drawing circuit diagram of randomly selected chips. Should not be
difficult for you if you have understood the core inner workings of your project.
Deliverables & Submission
You need to turn in the completed HDL files for all the chips.
Put your full name in the introductory comment present in each HDL code.
Use relevant code comments and indentation in your code.
Zip all the required HDL files into a compressed file FirstName-LastName-UIN.zip
Submit this zip file on eCampus.
Late Submission Policy: Refer to the Syllabus
Background
The computer’s main memory, also known as Random Access Memory (RAM), is an
addressable sequence of n-bit registers, each designed to hold an n-bit value. In this project you
will gradually build a RAM module. This involves two main issues: (i) how to use gate logic to
store bits persistently, over time, and (ii) how to use gate logic to locate (“address”) the memory
register on which we wish to operate. In addition, you will build functions that are constructed
with combinational and sequential logic design elements.
Objective
Build all the chips described in the list below. The only building blocks that you can use are
primitive DFF gates to start with, and subsequently chips that you will build on top of
them, and chips described in earlier projects.
Chips
Chips Name: Description File Name
Bit 1-bit register (use DFF) Bit.hdl
Register 16-bit register Register.hdl
RAM8 8 16-bit register memory RAM8.hdl
RAM64 64 16-bit register memory RAM64.hdl
RAM512 512 16-bit register memory RAM512.hdl
PC 16-bit program counter PC.hdl
Aggie Cipher 4-bit counter using D flip flop AggieCipher.hdl
Fibonacci Fibonacci Sequence generator Fibonacci.hdl
Aggie Cipher
Design a simple cipher logic which generates a code which is equal to a user-provided 4-bit input
+ the value generated from a counter, where counter value starts from 0000, and increments by 1
every clock cycle. The counter wraps to 0000 when it reaches a count of 15. You may use the
program counter (PC) designed in prior exercise to implement the Aggie Cipher logic.
out=in+counter, where counter={0,1,2,3,4,5,6,….,15,0,1,2,…..}
Fibonacci Sequence generator:
The general Fibonacci sequence is a sequence that starts with f0=0 and f1=1 . The next number
in the sequence is the sum of the previous two numbers. So the Fibonacci number sequence
generated in our circuit will be:
0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89…
Here is the circuit you may use. You need to understand the working of this circuit along
with its .tst and .cmp files. Explain the logic as comments in your HDL file.
To use this circuit, you have to control these signals, namely, enable1, enable2, enable3 and
msel.
● msel=0 will select the starting values f0 and f1 of the Fibonacci Sequence
● msel=1 will keep running the Fibonacci sequence with sum(t+1) ← sum(t) + sum(t-1) for
clock cycle t
● enable1=1 or enable2=1 or enable3=1 activate respective registers by loading the
corresponding input values to corresponding register outputs
● enable1=0 or enable2=0 or enable3=0 retain the register outputs from the previous
cycle
The test file Fibonacci.tst assigns the values to these control signals.
See how output in the Fibonacci.out file changes while changing those signals.
For each chip, we supply a skeletal .hdl file with a missing
implementation part.
In addition, for each chip from Bit till PC we supply a .tst script
that instructs the hardware simulator how to test it, and .cmp
(“compare file”) containing the correct output that this test should
generate.
For Aggie Cipher and Fibonacci, we provide incomplete .tst files.
Your task is to complete and test the supplied skeletal .hdl files
while also completing the .tst files for AggieCipher and Fibonacci
Contract
When loaded into the supplied Hardware Simulator, your chip design (modified .hdl program),
tested on the supplied .tst script, must produce the outputs listed in the supplied .cmp file. If that
is not the case, the simulator will let you know.
Resources
The relevant reading for this project is
Chapter 3 https://docs.wixstatic.com/ugd/44046b_1801b5682e4d4a67bd05e14235665d8b.pdf
Appendix A https://docs.wixstatic.com/ugd/44046b_d715f80dca2a43af926131a52e3d3d90.pdf
Specifically, all the chips described in Chapter 3 should be implemented in the Hardware
Description Language (HDL) specified in Appendix A.
The resources that you need for this project are the supplied Hardware Simulator and the files
listed above. Download your hdl files from ecampus and replace these files to those stored in
your projects/03 directory.
Tips
The Data Flip-Flop (DFF) gate is considered primitive and thus there is no need to build it: when
the simulator encounters a DFF chip part in an HDL program, it automatically invokes the
built-in tools/builtInChips/DFF.hdl implementation.
Tools
Following is a screenshot of testing a built-in RAM8.hdl chip implementation on the Hardware
Simulator:

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