MNE_2202_-_Project.pdf

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Interfacing a VGA Monitor to Xilinx XC3S200 FPGA

Lecturer:

Dr. Edward Gatt

ejgatt@eng.um.edu.mt

Laboratory Tutors:

Dr. Ivan Grech

igrech@eng.um.edu.mt

Mr. Owen Casha

owen.casha@um.edu.mt

Assessment:

60 % Examination

40 % Assignment Î Tutorial Sheet (20%) / Project (20%)

Objectives

• Design a simple 3-bit VGA Controller using a VHDL code

• Implement the controller such that a VGA monitor can be interfaced to a

Xilinx XC3S200 FPGA

N.B. Since the implementation will be made on the Spartan-3 Starter Kit Board, the

students are encouraged to read through the following user guide before

starting their assignment:

http://lark.tu-sofia.bg/asic/labs/s3demo/Digilent_S3.pdf

to familiarise with its environment. In addition this document includes

information on the VGA Display interfacing.

Architecture Proposal

clk_in

arst_in

colour_in[2:0]

clk_in

arst_in

colour_in[2:0]

clk_in

arst_in

colour_in[2:0]

clk_in

arst_in

colour_in[2:0]

clk_in

arst_in

colour_in[2:0]

clk_in

arst_in

colour_in[2:0]

VGA Controller

VGA Controller

VGA Controller

VGA Controller

N/O

Button Switch

N/O

Button Switch

25 MHz

25 MHz

25 MHz

red_out

green_out

blue_out

red_out

green_out

blue_out

red_out

green_out

blue_out

red_out

green_out

blue_out

red_out

green_out

blue_out

red_out

green_out

blue_out

hs_out

vs_out

hs_out

vs_out

hs_out

vs_out

hs_out

vs_out

hs_out

vs_out

hs_out

vs_out

Dip Switches

Dip Switches

MNE 2202 Î Hardware Description Languages

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Input/Output Requirements:

clk_in

Main synchronization clock signal

arst_in

Asynchronous reset

colour_in [2:0]

Input data word which determines the colour of the

circle

red_out

Red Colour Enable

green_out

Green Colour Enable

blue_out

Blue Colour Enable

hs_out

Horizontal sync signal

colour_in = Ð100Ñ

vs_out

Vertical sync signal

Problem Description

colour_in 2 colour_in 1 colour_in 0

Circle Colour

Background

Colour

0

0

0

BLACK

WHITE

0

0

1

BLUE

0

1

0

GREEN

0

1

1

CYAN

1

0

0

RED

BLACK

1

0

1

MAGENTA

1

1

0

YELLOW

1

1

1

WHITE

The function of the VGA controller is to display a coloured circle located at the centre

of the screen and that has a radius of 250 pixels. The colour of the circle and that of

the background should be controlled by the user via the three dip switches connected

to the COLOUR_IN 3-bit bus according to the above table. The monitor should be

operated on a 640 x 480 resolution mode with refresh rate of 60 Hz.

The equation of a circle is given by:

(

) (

)

2

2

2

Y

−

Y

+

X

−

X

=

R

1

1

(

) (

) (

) (

)

Y

−

Y

×

Y

−

Y

+

X

−

X

×

X

−

X

=

R

×

R

1

1

1

1

where R is the radius of the circle and ( X 1 , Y 1 ) are the coordinates of the centre of the

circle.

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VGA Port on the Spartan-3 Development Board

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25 MHZ

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