MAS3506D datasheet(15/52 Pages) MICRONAS

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PRELIMINARY DATA SHEET

MAS 3506D

Micronas

3.3. I2C-Data Register (Subaddresses 68hex and

69hex) and the MAS 3506D DSP-Command

Syntax

The I2C data register is used to communicate with the

internal firmware of the MAS 3506D. It is readable

(subaddress “data_read”) and writable (subaddress

“data_write”) and also has a length of 16 bits. The data

transfer is done with the most significant bit (m) first.

A special command language is used that allows the

controller to access the DSP-registers and RAM-cells

and thus monitor internal states, set the parameters for

the DSP-firmware, control the hardware, and even pro-

vide a download of alternative software modules. The

DSP-commands consist of a “Code” which is sent to to

I2C-data register together with additional parameters.

Table 3–5 gives an overview over the different com-

mands which the DSP-core may receive. The “Code”

is always the first data nibble transmitted after the

“data_write” byte.

The control interface is also used for low-bit-rate data

transmission, i.e. MPEG-embedded ancillary data and

the WorldSpace Service Control Header. These data

are available in a specified memory area of the

MAS 3506D after successful decoding. The synchroni-

zation between controller and the MAS 3506D will be

done by observing the BC-FRAME-SYNC and MPEG-

FRAME-SYNC signals in register c8hex or at the corre-

sponding pins.

Table 3–4: Data register bit assignment

15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

...

SDW

data_write

Code,...

...,...

Table 3–5: Basic controller command codes for the MAS 3506D

Code

(hex)

Command

Function

Run

Start execution of an internal program. Run with start address 0hex means

freeze the operating system

Run Config

Start execution of an internal program and switch config RAM to P-RAM

Select SC

Select the Service Component

Read Ancillary Data

Read MPEG ancillary data

Read SCH-Data

Read Service Control Header

Write Register

An internal register of the MAS 3506D can directly be written to by the con-

troller

a, b

Write Memory

A block of the DSP memory can be written to by the controller. (This feature

may be used to download alternate programs.)

Read Register

The controller can read an internal register of the MAS 3506D

e, f

Read Memory

A block of the DSP memory can be read by the controller

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