DRP3510A Просмотр технического описания (PDF) - Micronas

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DRP3510A

Digital Radio Processor

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ADVANCE INFORMATION

DRP 3510A

6.3. The SDO1 Interface

The SDO1 interface sends a decoded 32 kHz audio sig-

nal back to the MSP. The 32 kHz signal is generated via

an internal high quality sample rate converter, which is

perfectly matched to the performance of the MSP DACs.

The cutoff frequency now is reduced to approximately

15 kHz. The signal of most of the free to air ADR-sta-

tions, however, does not exceed this cutoff frequency.

The serial format generates 2*16 bits for stereo audio

samples on the data line SO1D, a word strobe on the

SO1I, and a serial clock at the SO1C line. This offers the

opportunity to use the MSPC DACs for analog output.

This connection to the MSPC is obligatory for every ap-

plication, even if it is not intended to use the MSPC

DACs. This is due to the fact that the clock synchroniza-

tion between DRP and MSP uses this connection. The

timing of the SDO1 interface is shown in Fig. 6–3.

6.4. The PIO Interface

The PIO interface can be used in two different modes.

In the standard mode, the PIO lines PI0..PI3 are used to

select the crystal frequency or to switch between differ-

ent applications; and the PI12..PI19 lines are used as

signalling outputs or serial interface pins (see section

3.2.). In a second mode, the DMA mode (direct memory

access), the internal MPEG Layer 2 data stream (after

descrambling but before decoding) is provided on the

PIO lines PI12..PI19.

6.4.1. General Purpose PIO Mode

The general purpose PIO mode is selected after reset.

In this mode, the PIO-lines have the functionality as de-

scribed below. The PI0 and PI3 pins are only read out af-

ter a reset of the DRP.

SO0C

SO0I

0

left 1

15 0

right 1

15

left 2

SO0D

Fig. 6–3: Schematic timing of the SDO1 output interface

high

low

high

right 2

low

high

low

Table 6–1: Functionality of the PIO mode

PI0

PI1

PI2

PI3

crystal

select

Mode

select

0 18.432

ADR

1 24.576

L2 de-

coder

PI14

SI1D*

PI15

SI1I*

PI16

SI1C*

Alternative input lines

(for example: I2S to SP/DIF con-

version in combination with

downloaded software)

PI18

CRCE

no CRC

error

CRC

error

PI19

FSI (def.

mode)

anc.data

available

anc.data

invalid

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