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ATSAM3103

6093A–DRMSD–25-Oct-04

allowing inter P24 communication at the current sampling rate. Slots 0 to 7 are reserved

for a specific router DSP, which also handles audio out, audio in, and remix send.

Async Bus

The Async Bus is 24-bit data inside the chip and 16-bit outside.

The P16 processor normally masters the Async Bus; it can read/write the P24 memories

and the external or embedded ROM/RAM. However, each P24 can request a bus mas-

ter cycle for accessing external ROM/RAM or other P24 memories. This allows efficient

intercommunication between several P24s on asynchronous block basis. Specific P24

instructions FLOAT and FIX convert fixed-point DSP data to floating-point 16 bits. This

allows for 20-bit audio dynamic range when using 16-bit external memory.

16-bit Processor

The P16 processor is widely used in ATSAM products. Using the P16 allows to keep the

large firmware investments from the ATSAM97xx series. A built-in ROM, connected to

the P16, holds basic input/output software (BIOS) for peripherals such as UART,

DataFlash, SmartMedia, MPU, as well as a debugger using a dedicated asynchronous

serial line. The firmware can reside on external parallel ROM/Flash or it can be down-

loaded at power-up into the built-in 16K x 24 RAM from serial EEPROM, DataFlash,

SmartMedia or host.

MMU (Memory

Management Unit)

The MMU handles transfer requests between the external or embedded RAM/ROM, the

P16 and the P24s through the Async Bus. The ATSAM3103 includes an on-chip 16K x

24 RAM.

Router: Final ACC, MIX,

Audio Out, Audio In

This block includes a RAM, accessed through the Async Bus, which defines the routing

from the Sync Bus to/from the Audio I/O or back to the Sync Bus (mix send). It takes

care of mix and accumulation from Sync Bus samples. Eight channels of audio in and

eight channels of audio out are provided (4 stereo in/out, I2S format). The stereo audio

in channels may have a different sampling rate than the audio out channels. In this case,

one or more P24s take care of sampling rate conversion.

I/O

The ATSAM3103 includes versatile I/Os that share common pins for reduced pin count

and small IC footprint. Most I/Os, when not used for a specific function, remain available

as firmware controlled general-purpose pins.

The following peripherals are included on-chip:

•

2 x 8-bit timers

•

2 x 16-bit timers

•

Parallel slave 8-bit port, MPU401 compatible

•

Parallel master 8-bit port, for connection to SmartMedia and/or LCD display,

switches, etc.

•

2 x asynchronous bi-directional serial ports

•

Synchronous serial slave port (SPI type host connection)

•

SPI master bi-directional port for EEPROM or DataFlash connection

•

Firmware controlled I/O pins