Altera MAX II Manuel d'utilisateur télécharger pdf (Page 32)

2–24 Development Kit Version 1.1.0 Altera Corporation

MAX II Development Kit Getting Started User Guide July 2005

Reference Designs

Figure 2–8. Design Overview

Linear Feedback Shift Register (LFSR)

The LFSR is a 32-bit register chain that uses combinational feedback paths

to generate pseudo-random number values. Nine taps on the 32-bit chain

are used to derive three decimal numbers that represent the value on each

reel (3 taps per reel). The LFSR is fed by a system clock, and the values of

each reel are constantly changing on the rising edge of each clock cycle.

When a player toggles the Spin button during game play, the block

captures the current value of each tap and feeds these values to the

Control block for further processing. See Figure 2–9.

Figure 2–9. Linear Feedback Shift Register Design

Control

This block manages the status and functionality of the player controlled

inputs Bet and Spin. The functionality of this block can be divided into

three major areas:

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Altera MAX II Manuel d'utilisateur Page 32