BT8375 CONEXANT [Conexant Systems, Inc], BT8375 Datasheet - Page 158

• Manufacturer Part Number: BT8375
• Description: single chip transceivers for T1/E1 and Integrated Service Digital Network (ISDN) primary rate interfaces
• Manufacturer: CONEXANT [Conexant Systems, Inc]

3.7 Receive LIU Registers
CPDERR
JMPTY
ZCSUB
EXZ
3-40
021—Receive LIU Status (RSTAT)
CPDERR
7
CLAD Phase Detector Error—Indicates the CLAD phase detector has lost lock with respect to
the selected CLADI reference clock.
JAT Empty/Full—Indicates whether the elastic store is within two unit intervals of being
empty or two unit intervals of being full. JMPTY is not updated (holds its prior value) until the
elastic store is within two unit intervals of its limit. The processor reads JMPTY and CPDERR
to determine what event caused JERR or CKERR [addr 006].
Zero Code Substitution—Indicates one or more B8ZS/HDB3 substitution patterns have been
detected on receiver input data, depending on T1/E1N [addr 001] line rate selection. ZCSUB is
reported, regardless of whether or not ZCS decoding is enabled [RAMI; addr 040]. ZCSUB is
latched active high upon detection of the first ZCS pattern, and the active high hold interval is
defined by LATCH_ERR [addr 046].
Excessive Zeros—Reports one or more long strings of 0s detected on RTIP/RRING data
inputs. Depending on bits RZCS [addr 040] and T1/E1N [addr 001], occurrences of 8, 10, or
16 consecutive zeros are detected. EXZ is latched active high upon detection of the first error.
The active high hold interval is defined by LATCH_ERR [addr 046]. If EXZ_LCV [addr 045]
is enabled, EXZ errors are also accumulated in LCV count [addr 054, 055].
JMPTY
6
JMPTY
EXZ
0
1
1
1
ZCSUB
X
0
1
ZCSUB
0
1
1
5
JERR
T1/E1N
0
1
1
X
0
1
1
EXZ
T1/E1N
4
Conexant
No error
JAT Overflow
JAT Underrun
X
0
1
RZCS
X
X
0
1
BPV
3
No ZCS patterns detected
HDB3 pattern detected
B8ZS pattern detected
Fully Integrated T1/E1 Framer and Line Interface
No error
10 consecutive 0s
16 consecutive 0s
8 consecutive 0s
JAT Status
—
2
ZCSUB Status
EXZ Status
EYEOPEN
Bt8370/8375/8376
1
N8370DSE
PRE_EQ
0