Rainbow Electronics DS21458 - Manual (Page 188)

DS21455/DS21458 Quad T1/E1/J1 Transceivers
188 of 270
Register Name:
BC2
Register Description: BERT Control Register 2
Register Address: E1h
Bit
# 7 6 5 4 3 2 1 0
Name EIB2 EIB1 EIB0 SBE RPL3 RPL2 RPL1 RPL0
Default 0 0 0 0 0 0 0 0
Bits 0 to 3/Repetitive Pattern Length Bit 3 (RPL0 to RPL3). RPL0 is the LSB and RPL3 is the MSB of a nibble that
describes the how long the repetitive pattern is. The valid range is 17 (0000) to 32 (1111). These bits are ignored if the receive
BERT is programmed for a pseudorandom pattern. To create repetitive patterns less than 17 bits in length, the user must set the
length to an integer number of the desired length that is less than or equal to 32. For example, to create a 6-bit pattern, the user
can set the length to 18 (0001) or to 24 (0111) or to 30 (1101).
Length
(Bits)
RPL3 RPL2 RPL1 RPL0
17 0 0 0 0
18 0 0 0 1
19 0 0 1 0
20 0 0 1 1
21
0 1 0 0
22 0 1 0 1
23 0 1 1 0
24 0 1 1 1
25 1 0 0 0
26 1 0 0 1
27 1 0 1 0
28 1 0 1 1
29 1 1 0 0
30 1 1 0 1
31 1 1 1 0
32 1 1 1 1
Bit 4/Single Bit Error Insert (SBE). A low-to-high transition will create a single bit error. Must be cleared and set again for a
subsequent bit error to be inserted.
Bits 5 to 7/Error Insert Bits 0 to 2 (EIB0 to EIB2). Will automatically insert bit errors at the prescribed rate into the
generated data pattern. Can be used for verifying error detection features.
EIB2 EIB1 EIB0 ERROR RATE INSERTED
0 0 0 No errors automatically inserted
0 0 1 10E-1
0 1 0 10E-2
0 1 1 10E-3
1 0 0 10E-4
1 0 1 10E-5
1 1 0 10E-6
1 1 1 10E-7