
XRT86SH328
PRELIMINARY
228
28-CHANNEL DS1/E1 FRAMER/LIU WITH DS3 MUX & VT-MAPPER - SONET APPLICATIONS
REV. P1.0.6
BIT [7:0] - PRBS Error Count - Upper Byte:
These RESET-upon-READ bits, along with that within the DS3 Framer Block - PRBS Bit Error Count Register - LSB
combine to reflect the cumulative number of PRBS bit errors that the PRBS Receiver (within the Receive DS3 Framer
block) has detected since the last read of this register. This register contains the Most Significant byte of this 16-bit
expression.
N
OTE
:
This register is only active of the PRBS Receiver (within the Receive DS3 Framer block) has been enabled.
BIT [7:0] - PRBS Error Count - Lower Byte:
These RESET-upon-READ bits, along with that within the DS3 Framer Block - PRBS Bit Error Count Register - MSB
combine to reflect the cumulative number of PRBS bit errors that the PRBS Receiver (within the Receive DS3 Framer
block) has detected since the last read of this register. This register contains the Least Significant byte of this 16-bit
expression.
N
OTE
:
This register is only active of the PRBS Receiver (within the Receive DS3 Framer block) has been enabled.
BIT [7:2] -
Unused:
BIT 1 - Erred Second:
This READ-ONLY bit-field indicates whether or not the Receive DS3 Framer block has declared the last one-second
accumulation period as an Erred Second.
The Receive DS3 Framer block will declare an Erred Second if it detects any of the following events, within a given one-
second period.
P-Bit Errors
CP-Bit Errors
Framing Bit (F or M) Errors
`
0 - Indicates that the Receive DS3 Framer block has NOT declared the last one-second accumulation period as being
an Erred Second.
T
ABLE
324: DS3 F
RAMER
B
LOCK
- PRBS B
IT
E
RROR
C
OUNT
R
EGISTER
- MSB (A
DDRESS
= 0
X
0E68)
B
IT
7
B
IT
6
B
IT
5
B
IT
4
B
IT
3
B
IT
2
B
IT
1
B
IT
0
PRBS Error Count[15:8]
RUR
RUR
RUR
RUR
RUR
RUR
RUR
RUR
0
0
0
0
0
0
0
0
T
ABLE
325: DS3 F
RAMER
B
LOCK
- PRBS B
IT
E
RROR
C
OUNT
R
EGISTER
- LSB (A
DDRESS
= 0
X
0E69)
B
IT
7
B
IT
6
B
IT
5
B
IT
4
B
IT
3
B
IT
2
B
IT
1
B
IT
0
PRBS Error Count[7:0]
RUR
RUR
RUR
RUR
RUR
RUR
RUR
RUR
0
0
0
0
0
0
0
0
T
ABLE
326: DS3 F
RAMER
B
LOCK
- O
NE
S
ECOND
E
RROR
S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
0E6D)
B
IT
7
B
IT
6
B
IT
5
B
IT
4
B
IT
3
B
IT
2
B
IT
1
B
IT
0
Unused
Erred
Second
Severely
Erred
Second
R/O
R/O
R/O
R/O
R/O
R/O
R/O
R/O
0
0
0
0
0
0
0
0