BT8376EPF datasheet(159/323 Pages) CONEXANT

159 / 323 page

Bt8370/8375/8376

Fully Integrated T1/E1 Framer and Line Interface

3.7 Receive LIU Registers

N8370DSE

Conexant

3-41

BPV

Bipolar Violation—Reports one or more bipolar violations detected on RTIP/RRING data

inputs. Depending on RZCS [addr 040], the BPV may include bipolar violations received as

part of a B8ZS or HDB3 0 code substitution. Detection of BPV or LCV errors can be selected,

regardless of whether or not receive ZCS decoding is enabled [RAMI; addr 040]. BPV is

latched active high upon detection of the first error. The active high hold interval is defined by

LATCH_ERR [addr 046]. BPV errors are also accumulated in LCV count [addr 054, 055].

EYEOPEN

Equalization State—EYE OPEN indicates the real-time status of RLIU adaptive equalizer, and

is intended only for diagnostic testing. Remains active as long as a valid receive AMI signal is

present on RTIP/RRING. When SQUELCH [addr 020] is enabled and EYEOPEN status is 0,

RLIU data outputs are forced to 0.

0= Indicates the received signal is not valid.

1= Indicates the received signal is valid and the RPLL is locked.

PRE_EQ

Pre-Equalizer status. Indicates whether the pre-equalizer is enabled (on) or disabled (off).

0= PRE_EQ is off

1= PRE_EQ is on

See PRE_EQ register [addr 02A]

022—Receive LIU Configuration (RLIU_CR)

FRZ_SHORT

Freeze equalizer for short lines—When set, the equalizer is not updated when the received

signal is approximately –15 dB or larger.

0 = equalizer updates for all lines

1 = enable equalizer freezing if short line

HI_CSLICE

High Clock Slicer Threshold.

0 = normal operation

AGC[1:0]

AGC Observation Window—Set to 0x11 for normal operation. Determines the period, in bit

times, for Automatic Gain Control updates.

00 = 32 bits

01 = 128 bits

10 = 512 bits

11 = 2048 bits

EQ_FRZ

Freeze EQ Coefficients.

0 = normal operation, equalizer always updates depending on

FRZ_SHORT setting

1 = freeze coefficients, equalizer does not update. Does not affect AGC

operation

BPV

T1/E1N

RZCS

BPV Status

No error

All BPVs, including HDB3 coded BPV

Code violation per ITU 0.162 (two consecutive BPVs of

same polarity)

All BPVs, including B8ZS coded BPV

Only BPVs that are not part of B8ZS

FRZ_SHORT

HI_CSLICE

AGC[1]

AGC[0]

EQ_FRZ

OOR_BLOCK

RLB0

LONG_EYE

BT8376EPF Datasheet(PDF) 159 Page - Synaptics Incorporated.

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