BT8376EPF datasheet(160/323 Pages) CONEXANT

160 / 323 page

Bt8370/8375/8376

3.7 Receive LIU Registers

Fully Integrated T1/E1 Framer and Line Interface

3-42

Conexant

N8370DSE

OOR_BLOCK

Disable Automatic RLBO—When active, automatic RLBO switching is disabled when the

ADC is out of range.

0 = normal operation

1 = disable RLBO switching

RLB0

Receiver Line Build Out—Enables receive signal attenuation.

0 = RLBO forced off (normal operation)

1 = enable automatic RLBO

LONG_EYE

Eye Open Timeout

0 = 4096 bit timeout

1 = 8192 bit timeout (normal operation)

023—RPLL Low Pass Filter (LPF)

LPF[6:0]

RPLL Low Pass Filter Gain—Reserved for CONEXANT Production test. Determines clock

recovery RPLL input jitter tolerance and the worst case signal acquisition time. The initial

default value is optimized for maximum input jitter tolerance.

024—Variable Gain Amplifier Maximum (VGA_MAX)

VGA_MAX[5:0]

VGA Maximum—The processor can limit receiver sensitivity by programming the maximum

allowable input signal gain into the VGA_MAX register. This option is used for short and

medium haul interfaces that must declare loss of signal when the receive level falls below a

certain level. The default value is 0x3F for Bt8370 and 0x2F for Bt8375/6.

Table 3-10 contains approximate VGA_MAX settings for the receive sensitivity values. The

sensitivity value is the received signal level (below nominal) at which analog loss of signal

(RALOS) occurs. These values are applicable only when the RLBO and the PRE_EQ are

disabled. RLBO is disabled when the receive level is less than about –8 dB, or when RLBO is

forced off: RLBO = 0 (reg RLIU_CR [add 022]. The PRE_EQ is disabled when the receive

level is greater than about –24 dB, or when it is forced off: register PRE_EQ [addr 02A] =

(10XXXXXX).

—

LPF[6]

LPF[5]

LPF[4]

LPF[3]

LPF[2]

LPF[1]

LPF[0]

——

VGA_MAX[5]

VGA_MAX[4]

VGA_MAX[3]

VGA_MAX[2]

VGA_MAX[1]

VGA_MAX[0]

Table 3-10. VGA Maximum Settings for Receive Sensitivity

Rx Sensitivity

0 dB

–5 dB

–10 dB

–15 dB

–20 dB

–25 dB

–30 dB

–35 dB

–40 dB

–45 dB

VGA_MAX

0x0B

0x12

0x19

0x1E

0x23

0x27

0x2C

0x2F

0x33

0x37

BT8376EPF Datasheet(PDF) 160 Page - Synaptics Incorporated.

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