Altera Cyclone II FPGA Starter Manuel d'utilisateur télécharger pdf (Page 45)

Altera Corporation 6–3

October 2006 Cyclone II FPGA Starter Development Kit User Guide

Advanced Examples

The block diagram (Figure 6–2) shows that the Music Synthesizer

comprises four major blocks:

■ DEMO_SOUND stores a sample sound for the user to play.

■ PS2_KEYBOARD processes user input from the PS/2 keyboard.

■ STAFF displays the corresponding keyboard diagram on the VGA

monitor when a key is pressed

■ TONE_GENERATOR represents the core of the music synthesizer

SOC.

Use SW9 to switch the music source between PS2_KEYBOAD and the

DEMO_SOUND block. To repeat the demo sound, press KEY1.

The TONE_GENERATOR can produce two tones, (1) String and (2)

Brass, selected by SW0. The audio CODEC used on the development

board has two channels, turned ON/OFF by SW1 and SW2.

Figure 6–2. Block Diagram of the Music Synthesizer Design

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Altera Cyclone II FPGA Starter Manuel d'utilisateur Page 45