FM-1288-GE-400B View Datasheet(PDF) - Unspecified

Part Name

Description

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FM-1288-GE-400B

High Performance Voice Processor for Automotive Handsfree

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2. Functional Description

2.1 Overview

The FM1288 voice processor digitizes the microphone input of near-end talker signal and performs

acoustic echo cancellation and noise suppression on it, further enhancements such as gain adjustment

and equalization can also be conducted. The processed signal is sent either through the PCM Serial Port

digitally, or through the D/A converter and then via Line_Out pin as analog output. The far-end talker

signal enters as the line input signal either digitally from Serial PCM Port, or from the Line_In analog

signal pin. This far-end talker signal could be further enhanced by signal processing, such as Bright Voice

Enhancement, Equalization, or Dynamic Range Control, before sending out to the analog SPK_Out pin via

the D/A.

2.2 Serial EEPROM Interface (Pins 15, 16)

FM1288 supports an optional serial EEPROM boot-up, should the user elect to design the system with it.

The serial EEPROM is used for

 Storing the configuration parameters required for system initialization during power-up and reset,

should the system designer elect this option, and

 Storing “patch-program” provided by Fortemedia for either functional customizations or bug-fixes

It supports 16Kbit or larger IIC EEPROM devices such as 24c16, 24c32, 24c64, etc.

Upon power-up or reset, the FM-1288 processor will automatically attempt auto-detect via read

operations from the serial EEPROM interface. If the system design includes an EEPROM and the

EEPROM content conforms to the EEPROM format description below, the FM-1288 will be initialized to the

pertinent state and becomes functional.

The EEPROM content are organized into contiguous bytes starting from address zero:

Byte Address

Byte content

Comment

0

Any value

First byte always a dummy byte

1

Byte 1 command 1

2

Byte 2 command 1

3

Byte 3 command 1

4

Byte 4 command 1

Each EEPROM command sequence is 6

5

Byte 5 command 1

bytes

6

Byte 6 command 1

7

Byte 1 command 2

8

Byte 2 command 2

.

.

.

.

6N

Byte 5 command N

N is the last EEPROM command

6N + 1

Byte 6 command N

6N + 2

Must be 0xF0

Last byte ends read operation

When the FM-1288 processor reads from the EEPROM, it interprets the content according to the data

organization depicted above, and executes the commands sequentially to perform initialization. Each

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