6

6237A–DRMSD–29-May-06

ATSAM3703

5.

DSP Capacity and I/O Configuration

5.1

DSP Considerations

The ATSAM3703 include 3 x P24 DSPs.

Table 5-1 lists the performance achievable by the P24.

The ATSAM3703 runs firmware directly from an embedded EEPROM memory. It may also run

firmware from local RAM. The ATSAM3703 is the ideal choice when external components count

should be minimized and 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 (refer to the pinout to identify the exclusions). The two main types of operation are host-con-

trolled and stand-alone.

5.2.1

Host-controlled Operation

There are 3 main ways to communicate with a host processor:

• 8-bit parallel MPU type bi-directional interface

signals: D7 - D0, CS, WR, RD, A0, IRQ

• Asynchronous serial, MIDI_IN

• Synchronous serial

signals: SDIN, SCLK, SYNC, INT

5.2.2

Stand-alone Operation

Possible stand-alone modes are:

• Firmware into built-in EEPROM memory

• Firmware into external SmartMedia. In this case, the firmware should reside in the

SmartMedia reserved sectors starting at sector # 1.

Table 5-1.

Performance with P24

Function

P24s required

MP3 decode

3

Stereo reverb and chorus @48 kHz

1

31-band equalizer @96 kHz

3

Stereo 31-band equalizer @48 kHz

3