Baseband Signal Processor

FX829

© 1997 Consumer Microcircuits Limited

16

D/829/4

MOD LEVELS Register (Hex address $12)

The six least significant bits of the first byte in this register are used to set the attenuation of the Modulator 1

amplifier and the five least significant bits of the second byte in this register are used to set the attenuation of

the Modulator 2 amplifier, according to the tables below:

5

4

3

2

1

0

Mod. 1 Attenuation

4

3

2

1

0

Mod. 2 Attenuation

0

X

X

X

X

X

1

0

0

0

0

0

>40dB

0

0

0

0

0

>40dB

1

0

0

0

0

1

12.0dB

0

0

0

0

1

6.0dB

1

0

0

0

1

0

11.6dB

0

0

0

1

0

5.8dB

1

0

0

0

1

1

11.2dB

0

0

0

1

1

5.6dB

1

0

0

1

0

0

10.8dB

0

0

1

0

0

5.4dB

1

0

0

1

0

1

10.4dB

0

0

1

0

1

5.2dB

1

0

0

1

1

0

10.0dB

0

0

1

1

0

5.0dB

1

0

0

1

1

1

9.6dB

0

0

1

1

1

4.8dB

1

0

1

0

0

0

9.2dB

0

1

0

0

0

4.6dB

1

0

1

0

0

1

8.8dB

0

1

0

0

1

4.4dB

1

0

1

0

1

0

8.4dB

0

1

0

1

0

4.2dB

1

0

1

0

1

1

8.0dB

0

1

0

1

1

4.0dB

1

0

1

1

0

0

7.6dB

0

1

1

0

0

3.8dB

1

0

1

1

0

1

7.2dB

0

1

1

0

1

3.6dB

1

0

1

1

1

0

6.8dB

0

1

1

1

0

3.4dB

1

0

1

1

1

1

6.4dB

0

1

1

1

1

3.2dB

1

1

0

0

0

0

6.0dB

1

0

0

0

0

3.0dB

1

1

0

0

0

1

5.6dB

1

0

0

0

1

2.8dB

1

1

0

0

1

0

5.2dB

1

0

0

1

0

2.6dB

1

1

0

0

1

1

4.8dB

1

0

0

1

1

2.4dB

1

1

0

1

0

0

4.4dB

1

0

1

0

0

2.2dB

1

1

0

1

0

1

4.0dB

1

0

1

0

1

2.0dB

1

1

0

1

1

0

3.6dB

1

0

1

1

0

1.8dB

1

1

0

1

1

1

3.2dB

1

0

1

1

1

1.6dB

1

1

1

0

0

0

2.8dB

1

1

0

0

0

1.4dB

1

1

1

0

0

1

2.4dB

1

1

0

0

1

1.2dB

1

1

1

0

1

0

2.0dB

1

1

0

1

0

1.0dB

1

1

1

0

1

1

1.6dB

1

1

0

1

1

0.8dB

1

1

1

1

0

0

1.2dB

1

1

1

0

0

0.6dB

1

1

1

1

0

1

0.8dB

1

1

1

0

1

0.4dB

1

1

1

1

1

0

0.4dB

1

1

1

1

0

0.2dB

1

1

1

1

1

1

0dB

1

1

1

1

1

0dB

X = don't care

MOD1 ENABLE

(Bit 5, first byte)

When this bit is "1" the MOD1 attenuator is enabled.

When this bit is "0" the MOD1 attenuator is disabled (i.e. powersaved).

Bits 6 and 7 in the first byte and bits 5, 6 and 7 in the second byte should always

be set to "0". MOD LEVELS (1) register is loaded first.

Note: The MOD2 attenuator is enabled by the AMP2 ENABLE signal (bit 6 of

CONTROL1 register).

RX SYNC WORD Register (Hex $44)

This is a two byte register that defines the 16-bit programmable synchronisation word. This word is compared

with the incoming Rx data and, if a match is found, it is indicated in the STATUS register and an interrupt is

generated. Bit 15, the MSB of the first byte, is loaded first.