Altera Cyclone II FPGA Starter - Manual (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