bt8375kpf Conexant Systems, Inc., bt8375kpf Datasheet - Page 159

• Manufacturer Part Number: bt8375kpf
• Description: Single Chip Transceivers For T1/e1 And Integrated Service Digital Network Isdn Primary Rate Interfaces Systems
• Manufacturer: Conexant Systems, Inc.

Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
BPV
EYEOPEN
PRE_EQ
FRZ_SHORT
HI_CSLICE
AGC[1:0]
EQ_FRZ
N8370DSE
022— Receive LIU Configuration (RLIU_CR)
FRZ_SHORT
7
HI_CSLICE
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].
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.
Pre-Equalizer status. Indicates whether the pre-equalizer is enabled (on) or disabled (off).
See PRE_EQ register [addr 02A]
Freeze equalizer for short lines—When set, the equalizer is not updated when the received
signal is approximately –15 dB or larger.
High Clock Slicer Threshold.
AGC Observation Window—Set to 0x11 for normal operation. Determines the period, in bit
times, for Automatic Gain Control updates.
Freeze EQ Coefficients.
6
BPV
0
1
1
1
1
AGC[1]
T1/E1N
5
X
0
0
1
1
0= Indicates the received signal is not valid.
1= Indicates the received signal is valid and the RPLL is locked.
0= PRE_EQ is off
1= PRE_EQ is on
0 = equalizer updates for all lines
1 = enable equalizer freezing if short line
0 = normal operation
00 = 32 bits
01 = 128 bits
10 = 512 bits
11 = 2048 bits
0 = normal operation, equalizer always updates depending on
FRZ_SHORT setting
1 = freeze coefficients, equalizer does not update. Does not affect AGC
operation
RZCS
AGC[0]
X
0
1
0
1
4
Conexant
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
EQ_FRZ
3
OOR_BLOCK
BPV Status
2
RLB0
3.7 Receive LIU Registers
1
LONG_EYE
0
3-41