CX28398 Conexant Systems, CX28398 Datasheet - Page 161

• Manufacturer Part Number: CX28398
• Description: (CX28394 - CX28398) Quad/x16/Octal?T1/E1/J1 Framers
• Manufacturer: Conexant Systems

CX28394/28395/28398
Quad/x16/Octal—T1/E1/J1 Framers
RZCS
RESEED
BSTART
FRAMED
Table 3-12. Receive PRBS Test Pattern Measurements (1 of 2)
100054E
041—Receive Test Pattern Configuration (RPATT)
FRAMED
—
7
0
0
0
0
0
0
0
0
1
1
Receive B8ZS/HDB3 Zero Code Substitution (affects only BPV/LCV/EXZ counting)—When
set, the ZCS decoder does not include bipolar violations received as part of a B8ZS/HDB3
code in the LCV error count [addr 054, 055]. Otherwise, all bipolar violations are counted.
EXZ detection criteria is either 8 or 16 consecutive zeros, depending on RZCS configuration.
RESEED forces the PRBS sync detector to reseed and search for test pattern sync [PSYNC;
addr 00B]. The reseed and search algorithm remains active until test pattern sync is found.
Enable PRBS Detector and Start Counting PRBS Bit Errors—BERR [addr 058, 059] counting
is enabled when BSTART is active high, and pattern sync is found [PSYNC=1; addr 00B].
Otherwise, BERR counter holds its present value until cleared by a processor read.
PRBS Framed—When set, PRBS test pattern bits are not checked during F-bit locations in T1
mode or TS0 locations in E1 mode. Otherwise, test patterns are checked in all T1/E1 bit
locations. FRAMED, ZLIMIT, and RPATT establish the test pattern measurement type as
listed in
ZLIMIT
—
0 = ZCS decoder reports all occurrences of BPV; also selects EXZ = 16 zeros
1 = ZCS decoder does not report BPVs received as part of ZCS; also selects EXZ = 8 zeros
Reseed PRBS Sync Detector (auto clear)—If BSTART is active high, writing a one to
0 = no effect
1 = reseed and search for test pattern sync
0 = PRBS detector disabled and BERR stops counting
1 = enable PRBS detector and BERR counter
6
0
0
0
0
1
1
1
1
0
0
Table
RESEED
3-12.
5
RPATT
00
01
10
11
00
01
10
11
00
01
BSTART
Unframed 2
Unframed 2
Unframed 2
Unframed 2
Unframed 2
Unframed 2
Unframed 2
Unframed 2
Framed 2
Framed 2
4
Conexant
11
15
11
15
20
23
11
15
20
23
Test Pattern Measurements
FRAMED
with 7 zero limit
with 7 zero limit (non-std)
with 14 zero limit (QRSS/QRS/QRTS)
with 14 zero limit (non-std)
3
ZLIMIT
2
RPATT[1]
1
3.9 Receiver Registers
3.0 Registers
Inversion
RPATT[0]
Yes
Yes
Yes
No
No
No
No
No
No
No
0
3-39