Serial Bus 1

Bus 1 is used for communications between:

·System Control IC202

·Audio DSP IC501

·Audio 2 channel IC902

·Front, Rear, and Center D/A converters IC905 to IC907

System Control IC202 is the master IC. It sends and receives data on the serial data in (SI1, at IC202/pin 79) and out (SO1, at IC202/pin 80) lines. The data is always accompanied by serial clock (SC1, at IC202/pin 89) from IC202. There are always communications present at IC202/pins 79,80 and 89 as long as there is power applied just like in serial bus 0.

Audio DSP IC501

Bi-directional communications between System Control IC202 and IC501 is similar to that with EEProm IC201. Communications between System Control IC202 and Audio DSP IC501 are accomplished using:

·Two serial data lines (SO1 and SI1)

·Clock from IC202/pin 89

·Chip Select from IC601/pin 28

Periodically in IC202’s routine, Audio DSP IC501 is chip selected. When the chip select pin 62 line is brought low, data is transferred between the ICs on the data lines (SO1 and SI1).

25

IC Function

IC Name

Number

Function

 

 

 

System Control

IC202

Main Micro

 

 

 

Interface

IC201-FL101

Accepts user commands

 

Bd

(play, open tray, next, etc)

 

 

 

EEProm

IC201-MB85 Bd

Stores servo info

 

 

 

Audio DSP

IC501

Delays (echoes) for speaker

 

 

effects

 

 

 

Audio 2 channel D/A

IC902

D/A Converter for analog

Converter

 

audio

 

 

 

Front, Rear, Center,

IC905 - IC907

D/A Converter for 5.1 AC-3

D/A Converter

 

signal.

 

 

 

Audio 2 Channel D/A Converter IC902

Audio Front, Rear, and Center D/A Converters IC905 - IC907

System Control IC202 communicates with the remainder of the ICs on the serial bus 1 lines in a unidirectional manner. Each one of these D/A Converters has an individual chip select line from IC601. The SO1 data line from IC202/pin 80 is common to the D/A Converters. Data applies only to the D/A Converter when its chip line is low. The data as always is accompanied by bit clock from IC202/pin 89.

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Sony S530D manual Audio DSP IC501