QT2022/32 - Data Sheet: DS3051
If the CDR is not in lock the PRBS31 error counter will read AAAAh. The PRBS31 pattern generator and checker
can be used in conjunction with the PMA system loopback.
Figure 40: PRBS31 Pattern Checker
S0
S1
S2
S27
S30
S28
S29
PRBS31 Pattern Error
.
Table 42: PRBS31 Generator and Checker Control
LAN mode
WAN Mode
(QT2032 only)
Item
(QT2022 and QT2032)
Note
PRBS31 Generator Control
Register bit 3.42.4 (3.2Ah.4)
Register bit 2.7.4
Register bit 2.7.5
2.9
0 = disabled (default)
1 = enabled
PRBS31 Checker Control
16-bit Error Counter
Register bit 3.42.5 (3.2Ah.5)
3.43 (3.2B)
0 = disabled (default)
1 = enabled
16-bit, non-rollover (RO)
cleared on read
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