Owais Ibrahim Akram

Mohsin Murad

ONE OF THE BASIC ATTARI GAMES.

THE PONG GAME CONSISTS OF A BALL

RANDOMLY BOUNCING ON THE SCREEN.

A PADDLE AT THE BASE ENABLES

THE USER TO MAKE THE BALL BOUNCE BACK UP.

InTRODUCTION

MULTISYNC VGA MONITOR SUPPORTING 640X480 RESOLUTION.

XILINX SPARTAN-3 FPGA KIT.

TWO ONBOARD PUSH BUTTONS TO CONTROL PADDLE MOVEMENT.

50MHZ OSCILLATOR.

requirements

PUSH BUTTONS

quadA , quadB

vga_h_sync , vga_v_sync , vga_R , vga_G , vga_B

A VGA MONITOR

REQUIRES 5 SIGNALS TO

DISPLAY A PICTURE:

R,G & B (THE RED, GREEN AND BLUE SIGNALS).

HS & VS (THE HORIZONTAL AND VERTICAL SYNCRONIZATION).

dRIVING The Vga monitor

GENERATING R,G & B SIGNALS.

CLOCK DIVIDER.

VIDEO GENERATOR

DRAWING THE PADDLE

DRAWING THE BALL

MODULES USED

TWO ONBOARD PUSH BUTTONS FOR MOVING THE PADDLE LEFT OR RIGHT.

50HZ CLOCK REQUIRED FOR SCANNING THE PUSH BUTTONS.

6 CLOCK DIVIDER MODULES EACH DIVIDING THE CLOCK BY 10 (50MHZ/1000000HZ=50HZ).

IF quadA IS PRESSED THEN

PaddlePosition = PaddlePosition – 1;

IF quadB IS PRESSED THEN

PaddlePosition = PaddlePosition + 1;

PaddlePosition = PaddlePosition +/- 25; FOR FASTER MOVEMENT.

DRAWING THE PADDLE

16X16 PIXELS SQUARE.

RANDOM COLLISIONS.

4 “HOT SPOT” PIXEL, ONE IN THE MIDDLE OF

EACH SIDE OF THE BALL.

IF THE BALL DRAWS ITS “HOTSPOT” AT THE

SAME TIME THE PADDLE OR BORDER DRAWS

ITSELF, WE SAY THERE IS A COLLISION ON THAT

SIDE.

DRAWING THE BALL

THE ORIGINAL CODE USED NON PS/2 MOUSE FOR PADDLE MOVEMENT.

CD4093 IC WASN’T AVAILABLE.

THE PADDLE WAS UNCONTROLLABLE WHEN WE USED TWO PUSH BUTTONS AND 50MHZ CLOCK.

RESTRICTED MOVEMENT OF PADDLE.

pROBLEMS eNCOUNTERED

The original setup used Pluto fpga board with 25MHz internal crystal and a modified mouse to control

the paddle movement