5

6090D–DRMSD–12-Feb-07

ATSAM3308B

4.2

Musical Keyboard with Key Velocity

Figure 4-2.

Musical Keyboard with Key Velocity

• Up to 64-voice polyphony with effects

• Choice of GM+ sampled sounds from 4 Mbits to 64 Mbits

• Maximum external memory addressing range: 128 Mbits

5.

DSP Capacity and I/O Configuration

5.1

DSP Considerations

The ATSAM3308B includes 8 x P24 DSPs. Table 5-1 below lists the performance achievable by

the P24.

The ATSAM3308B runs firmware directly from an external ROM/Flash memory. It may also run

firmware from local RAM, thus freeing many I/O pins, which can then be used for application

dependent functions. The ATSAM3308B is the ideal choice when wavetable synthesis or many

I/O pins are required.

5.2

I/O Selection Considerations

I/Os are organized in groups, which can be mutually exclusive because they share the same IC

pins (please refer to the pinout to identify the exclusions). The two main types of operation are

host controlled and stand-alone.

Switches,

LCD Display

MIDI

Stereo

Audio In/Out

ATSAM3308

ROM

DAC

ADC

Keyboard

Table 5-1.

P24 Performance

Function

P24s Required

MP3 decode

3

12-voice wavetable synthesis @32 kHz

1

8-voice wavetable synthesis @48 kHz

1

Stereo reverb and chorus @48 kHz

1

Stereo 31-band equalizer @48 kHz

3