CR2 : NICAM control (read and write register)

SDI

ECT

MAE

FN1

UMT

LA1

LA0

BEA

0

0

00

000

1

MSB

LSB

SDI

: I

0 = Output, 1 = Input

ECT : Bit error rate counting time

0 = 128ms, 1 = 64ms

MAE : Max allowed errors

0 = 511, 1 = 255

FN1 : Set function of bit 0 in SR0, 0 = loss of

alignment (status), 1 = system status (I or

B/G)

UMT : Un-mute NICAM, 1 = un-mute, 0 = mute

LA1

: Language select 1 (LA1

⊕ SEL1)

LA0

: Language select 0 (LA0

⊕ SEL0)

BEA : Set C1-C3 function

ECT

MAE

BER MUTE

0

0

8.9 x 10

0

1

4.4 x 10

1

0

1.8 x 10

1

1

8.9 x 10

Un-mute at BER/4.

TDA8204B

Output (Pin)

BEA

01

C1 (21)

C1*

Single mono mode

C2 (20)

C2*

Dual mono mode

C3 (19)

C3*

Stereo mode

* Application control bit of NICAM signal

Note : C4 pin remains unchanged. The function of C1-C4 in SR0

remains unchanged.

CR3 : Switches (read and write register)

US1

US0

AUT

IBG

FS1

FS0

X

SYN

001

00001

MSB

LSB

US1 : User bit 1 (output)

US0 : User bit 0 (output)

AUT : Automatic selection, 1 = enable

IBG

: Select system I or B/G, 1 = B/G

FSn

: Force switch (see table)

SYN : 1 = synthesiser, 0 = dual VCXO

(carrier loop)

FS1

FS0

Selection

0

0

Auto NICAM

0

1

FM-Mono

1

0

FM-Stereo

1

1

NICAM

NICAM STAND-ALONE APPLICATION

The NICAM kit has been designed to be monitored

by the I

capability is offered to the designer for low cost

applications.

In order to know the status of the kit in stand-alone

mode, consider the contents of the four I

ters at power-ON (4 registers : SR0 - CR1 - CR2 -

CR3). Hardware configurable pins will be described

later.

1 - Power-ON Configuration

SR0 (status)

US2

C1

C2

C3

C4

MUT

LA2

L/S

US2

0

0

0

1

1

1

1

MSB

LSB

US2

:

Not used in stand-alone

C1

:

Application control bit status for

NICAM signal

C2

:

C3

:

C4

:

Reserve Sound Flag

MUT :

DAC outputs muted (demuted as soon

as NICAM appears)

LA2

:

the subframe alignment is been lost

L/S

:

FAW status (FN1 of CR2 = 0)

CR1 (R/W)

Q1

Q0

I2

I1

I0

G0

AUM

FRE

0

0

00

000

0

MSB

LSB

Q1

:

NICAM sound is sent on all matrix

outputs and on AMOx pins

Q0

:

I2

:

I1

:

G0

:

Gain = 0dB on AMOx

AUM :

AMOx pins un-muted

FRE

:

VCXO in normal mode

CR2 (R/W)

SDA

ECT

MAE

FN1

UMT

LA1

LA0

BEA

0

0

00

000

1

MSB

LSB

SDA

:

Normal mode

ECT &

MAE

:

BER = 1/112

FN1

:

Bit L/S of SR0 set to alignment loss

status

UMT

:

TDA8204B mute pin 25 to 0

LA1

:

Result depending of SEL1

LA0

:

Result depending of SEL0

BEA

:

Beacon decoding mode but all diodes

are OFF until a NICAM signal has been

found

CR3 (R/W)

US1

US0

AUT

IBG

FS1

FS0

X

SYN

0

0

1

000

01

MSB

LSB

US1

:

Not used in stand-by mode

US0

:

Not used in stand-by mode

AUT

:

Automatic standard

TDA8204B

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