PRELIMINARY

Rev F

PRELIMINARY

13

CPC5750

2.4 RX Path Gain: ±1dB Steps Register

FIve bits of this register determine the analog output amplifier gain in 1 dB steps as shown in the following table.

2.4.1 RXG (bits [4:0])

RXG is a 5-bit, 2's complement number between -12 and 12. This value sets the receive path gain in 1dB

increments. Values of RXG larger than +12 set a gain of +12dB. Values of RXG less than -12 set a gain of -12dB.

2.5 RX Path Gain: +0.1dB Steps Register

Four bits of this register determine the analog output amplifier gain 0.1 dB steps as shown in the following table.

2.5.1 RXB (bits [3:0])

RXB is a 4-bit number between 0 and +9. This value increases the receive path gain in 0.1 dB increments. These

bits are used in conjunction with the RXG bits to define a 9-bit gain value from -12 to +12.9dB in 0.1 steps. For

example, to set the receive gain to -3.1dB, the RXG bits are set for -4dB (11100) and the RXB bits are set for

+0.9dB (1001). The nine bit value 111001001(binary) provides for a receive gain = -4dB + 0.9dB = -3.1dB;

EX2: 110110011 = -5dB + 0.3dB = -4.7dB; EX3: 010011000 = +9.8dB. Values of RXB are always positive and

values greater than 9 continue to define the gain as +0.9dB.

The lower seven bits of this register determine which of the available 8-bit time slots the CPC5750 uses to receive

data when in the PCM Mode.

The lower three bits of this register delay the receiver from reading the selected time slot by 0 to 7 bits.

Register

7

6

5

4

3

2

1

0

Address

RX Path Gain: ±1dB Steps

-

-

-

RXG(4)

RXG(3)

RXG(2)

RXG(1)

RXG(0)

0x3

Default Value

0

0000000

-

Register

7

6

5

4

3

2

1

0

Address

RX Path Gain: +0.1dB Steps

----

RXB(3)

RXB(2)

RXB(1)

RXB(0)

0x4

Default Value

0

0000000

-

Register

7

6

5

4

3

2

1

0

Address

-

PRC(6)

PRC(5)

PRC(4)

PRC(3)

PRC(2)

PRC(1)

PRC(0)

0x5

Default Value

0

0000000

-

Register

7

6

5

4

3

2

1

0

Address

-----

PRB(2)

PRB1)

PRB(0)

0x6

Default Value

0

0000000

-