Introduction

Ezairo 8310 is an open-programmable DSP-based hybrid

specifically designed for use in high-performance hearing aids and

hearables. The Ezairo 8310 hybrid includes the Ezairo 8300

System-on-Chip (SoC), onsemi’s high-end DSP processor, as well as

the Macronix MX25R1635F ultra-low power flash memory.

Ezairo 8300 includes six programmable or semi-programmable

processing cores, providing a high degree of parallelism and

flexibility:

 The CFX is an open-programmable dual-Harvard 24 bits digital

signal processor (DSP) providing support for any type of audio

signal processing

 The Arm CortexR-M3 processor is a 32-bit RISC processor

providing support for general processing and interfacing to external

components

 The HEAR configurable accelerator core is optimized for

pre-programmed functions that are frequently needed in audio signal

processing

 The Filter Engine allows time domain filtering and supports an

ultra-low-delay audio path

 The LPDSP32 is an open-programmable dual-Harvard 32-bit DSP

 The Neural Network Accelerator that allows the Ezairo 8300 to

perform neural network computations in a highly efficient and

flexible way.

Ezairo 8300 includes four ADCs with signal detection mode and

two direct digital output drivers, with high quality and ultra-low power

performances. Ezairo 8300 also includes peripherals and interfaces

needed to make it a complete hardware platform when combined with

the MX25R1635F flash memory.

Ezairo 8300 also includes a Neural Network Accelerator that allows

the Ezairo 8300 to perform neural network computations is a highly

efficient and flexible way.

KEY FEATURES

 High Performance: Best in class MIPS/mW.

 Programmable Flexibility: the open-programmable

DSP-based system can be customized to the specific

signal processing needs of manufacturers. Algorithms

and features can be modified or completely new concepts

implemented without having to modify the chip.

 Highly-integrated SoC: the six-core architecture

includes a CFX DSP, an Arm Cortex-M3 Processor, a

HEAR Configurable Accelerator, a programmable Filter

Engine, a LPDSP 32 DSP and a Neural Network

Accelerator. The system also includes an efficient

input/output controller (IOC), system memories, input

and output stages along with a full complement of

peripherals and interfaces.

 CFX DSP: a highly cycle-efficient, programmable core

that uses a 24-bit fixed-point, dual-MAC, dual-Harvard

architecture. The CFX can be used as the master of the

whole Ezairo 8300 SoC.

 Arm Cortex-M3 Processor: a complete subsystem that

can be used as the master of the whole Ezairo 8300 SoC.

 HEAR Configurable Accelerator: a highly optimized

signal processing engine designed to perform common

signal processing operations and complex standard

filterbanks.

 Programmable Filter Engine: a filtering system that

allows applying a various range of pre- or post-processing

filtering, such as IIR, FIR and biquad filters.

 LPDSP32: a highly cycle-efficient, programmable core

that uses a 32-bit fixed-point, dual-MAC, dual-Harvard

architecture.

 Neural Network Accelerator (NNA): a configurable

hardware accelerator dedicated to support neural

networks with high energy efficiency.

 Selectable System Clock Speeds: from 2.56 MHz up

to 61.44 MHz, with clock throttling capabilities to

optimize the computing performance versus power

consumption ratio.

 Adaptive Voltage Scaling: automatically adjusts the

digital supply voltage (VDDC) level using a critical path

speed measurement block. This feature allows to

optimize the SoC’s power consumption in all situations.

 Ultra-low Delay path: the programmable Filter Engine

supports an ultra-low-delay audio path of min 10.4 s

(analog input to analog output) for features such as active

noise cancellation.

 Ultra-low Power Consumption: <0.7 mA @ 15.24

MHz system clock (CFX 97%, Arm Cortex-M3 processor

40%, HEAR 77%, FENG 9%, 2 ADC @ 20 kHz, 1 OD,

1 LSAD).

 High fidelity audio system: 108 dB system dynamic

range, up to 64 KHz of sampling frequency.

 Output drivers: capable of driving multiple types

of speakers.

 Versatile Memory Architecture: a total of 1433 kB

of memory, shared between the six programmable or

semi-programmable cores.

 Data Security: sensitive program data can be encrypted

for storage in external NVM to prevent unauthorized

parties from gaining access to proprietary algorithm and

intellectual property.

 Multiple Audio Input Sources: four analog input

channels (AI0 to AI3) that can be used simultaneously for

omni-directional and directional microphones, telecoils,

bone conducting microphones, an input from a remote

control interface, or a direct audio input.

 Signal Detection Mode: ultra-low-power detection

system for signals on any analog inputs.

 High Throughput Communication Interface: fast

I2C-based and SWJ-DP interfaces for quick download,

debugging and general communication.

 Highly Configurable Interfaces: two PCM interfaces,

three I2C interfaces, two I3C interfaces, two SPI

interfaces, a UART interface, an eMMC interface with

custom interface buffering, up to 36 GPIOs and 8 LSAD

inputs.

 Asynchronous Sample Rate Converter (ASRC):

provides a mean of synchronizing the audio sample rate

between an external radio chip and the Ezairo 8300.

 Two Audio Sink Clock Counters: Can be used to

measure the timing of the frame periods of an external

radio relative to the internal audio sampling rate.

 Fitting Support: support for Microcard, HI-PRO 2,

HI-PRO USB, QuickCom, and NOAHlink, including

NOAHlink’s audio streaming feature.

 Integrated Development Environment (IDE):

a graphical user interface with the capabilities to edit,

build and debug applications. It is the main programming

interface for the Software Development Kit (SDK).

 Complete C-development tool chain for the CFX

and the LPDSP32. Includes a C-compiler, an instruction

set simulator, an assembler/disassembler, a linker and

the IDE debugger integrated in the Ezairo 8300 SDK.

 Sample Code: The SDK includes several sample

applications and libraries to demonstrate key features

of Ezairo 8300. The libraries are typically provided

in compiled form with source code also available.

 Pb-Free, Halogen Free/BFR Free and are RoHS

Compliant.