2000 Jun 14

10

Philips Semiconductors

Preliminary specification

Digital audio broadcast channel decoder

SAA3500H

A[17:0]

D[7:0]

RD

WR

Fig.5 RAM access.

9.3

Parallel output interface

The digital parallel output interface can be used in 3 different modes depending on the OCIR and OEN select pins.

Output data shall be latched on the falling edge of OCLK.

Table 2

Parallel output modes

X = don’t care.

By means of an external digital-to-analog converter, either the CIR or I/Q data can be displayed on an oscilloscope.

Digital output data is clocked out on the falling edge of the OCLK output signal. In case of baseband output the OIQ signal

indicates, if the current sample is either I or Q data.

OCIR OEN

DESCRIPTION

0

0

channel impulse response sampled at 64 kHz, OIQ = frame trigger

1

0

baseband sampled at 2048 kHz and with I and Q data multiplexed

X

1

OUT[7:0], OIQ and OCLK disabled

OCLK

OUT[7:0]

OIQ

QI

Q

I

Q

4096 kHz

signed

2048 kHz

Fig.6 Baseband output signals (OCIR = HIGH, OEN = LOW).

OCLK

OIQ

64 kHz

unsigned

OUT[7:0]

trigger

Fig.7 CIR output signals (OCIR = LOW, OEN = LOW).