ATSAM2133B ATMEL Corporation, ATSAM2133B Datasheet - Page 4

• Manufacturer Part Number: ATSAM2133B
• Description: Low-power Synthesizer
• Manufacturer: ATMEL Corporation

P16 Control Processor
and I/O Functions
Memory Management
Unit (MMU)
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ATSAM2133B
The P16 control processor is a general-purpose 16-bit CISC processor core that runs
from external memory. It includes 256 words of local RAM data memory.
The P16 control processor writes to the parameter RAM blocks within the synthe-
sis/DSP core in order to control the synthesis process. In a typical application, the P16
control processor parses and interprets incoming commands from the MIDI UART or
from the MPU-401 interface and then controls the Synthesis/DSP by writing into the
parameter RAM banks in the DSP core. Slowly-changing synthesis functions, such as
LFOs, are implemented in the P16 control processor by periodically updating the DSP
parameter RAM variables.
The P16 control processor interfaces with other peripheral devices, such as the system
control and status registers, the on-chip MIDI UART, the on-chip timers and the MPU-
401 interface through specialized intelligent peripheral I/O logic. This I/O logic auto-
mates many of the system I/O transfers to minimize the amount of overhead processing
required from the P16.
The MPU-401 interface is implemented using one address line (A0), a chip select signal,
read and write strobes from the host and an 8-bit data bus (D0 - D7).
Karaoke and keyboard applications can take advantage of the 8-bit MPU-401 interface
to communicate with the ATSAM2133B at high speed, with the MIDI IN and MIDI OUT
signals remaining available.
The Memory Management Unit (MMU) block allows external ROM/Flash and/or internal
32K x 16 RAM memory resources to be shared between the synthesis/DSP and the P16
control processor. This allows a single device (i.e., internal RAM) to serve as delay lines
for the synthesis/DSP and as data memory for the P16 control processor.
2694A–DRMSD–05/03