SAA7345 Просмотр технического описания (PDF) - Philips Electronics

Номер в каталоге

Компоненты Описание

производитель

SAA7345

CMOS digital decoding IC with RAM for Compact Disc

Philips Electronics 

Philips Semiconductors

CMOS digital decoding IC with RAM for

Compact Disc

Product specification

SAA7345

WRITING DATA TO SAA7345; REPEAT MODE

The same command can be repeated several times (e.g. for fade function) by applying extra RAB pulses as shown in

Fig.6.

RAB

(microcontroller)

CL

(microcontroller)

DA

(microcontroller)

DA (SAA7345)

A3 A2 A1 A0 D3 D2 D1 D0

high impedance

Note that CL must stay HIGH between RAB pulses.

Fig.6 Microcontroller WRITE timing; repeat mode.

MGA380 - 1

READING STATUS INFORMATION FROM SAA7345

There are several internal status signals which can be made available on the DA line (Table 1).

Table 1 Internal status signals.

SIGNAL

SUBQREADY-I

MOTSTART1

MOTSTART2

MOTSTOP

PLL Lock

V1

V2

MOTOR-OV

DESCRIPTION

LOW if new subcode word is ready in Q-channel register.

HIGH if motor is turning at 75% or more of nominal speed.

HIGH if motor is turning at 50% or more of nominal speed.

HIGH if motor is turning at 12% or less of nominal speed.

HIGH if Sync coincidence signals are found.

Follows input on V1 pin.

Follows input on V2 pin.

HIGH if the motor servo output stage saturates.

The status signal to be output is selected by status control register (address 0010). The timing for reading the status

signal is shown in Fig.7.

Status read operation sequence

• Write appropriate data to register 0010 to select required status signal.

• With RAB LOW; set CL LOW.

• Set RAB HIGH; this will instruct the SAA7345 to output status signal on DA.

1998 Feb 16

8

Share Link: