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Bose Personalized Amplification System Panduan Pemecahan Masalah

1.7 Digital Signal Processor

1.7.1 Architecture

The DSP is an Analog Devices ADSP21065L processor. It boots from an EEPROM

SST20LE020, U462 [DSP PCB sheet 3, C7]. U462 accessed through boot memory space and

through external memory space 3. Either BMS or MS3 on the DSP will chip enable U462 and

then a standard write/read enable interface is used to address U462. The DSP is reset by the

microcontroller through RESET. Chip clock is locally provided through XTAL461 [A2] at 30 MHz

resulting in a 60 MHz internal clock speed.

1.7.2 Interface to Microcontroller

Besides the audio peripherals described in the previous section, the DSP only interface to the

microcontroller. The DSP receives data on FLAG4 (P10 on the micro), transmits data on FLAG5

(P11 on the micro) and FLAG11/P12 provide clocking. RESET/P13 provides the reset for the

DSP and the watchdog functionality. The interface signals are routed through CN341 [micropro-

cessor PCB sheet 2, C8] between DSP and microcontroller board.

1.7.3 Internal LED

The DSP displays a "heartbeat" signal to an internal LED on the DSP board though FLAG10.

1.8 Microcontroller

1.8.1 Overview

The microcontroller is clocked by X341 [D3] (12 MHz) and provides interfaces between nearly all

peripherals.

Pins

P24-P27

Preset switch CH 1, single digit

P20-P23

Preset switch CH 2, tens digit

P4-P7

Preset switch CH 1, single digit

P0-P3

Preset switch CH 1, tens digit

P10-P13

DSP Interface

P14-P15

Remote

P37/ADC7 B1 detection from AMP3 Out

P34

Power Amp Protection/Trouble

P33

Power Supply Protection

P30-P32

Interface to volume control chip

P44-P45

Power LED (red/green)

P43

Bass Sent detection from "Bass Line Out" static

1.8.2 Interface to Remote

Relay of DSP information to the Remote. The DSP in the power stand needs to transfer the clip

state, channel volume data (cause the table for channel volume in the DSP), system working

status to MCU. The communication adopts software simulation UART, with two I/O pins as RX

and TX. Communication rate is 4800bps, add start bit and stop, so every sending byte has 10

bits. Data is send according to frame format: frame head | every data | check sum. DSP will

transfer a frame every 100ms, and every sending will take about 15ms.

THEORY OF OPERATION

Interface

Table 6. Peripheral pins on the microcontroller

Type

static

SPI

Modified MIDI

Analog

Static

static