DS3141 datasheet(47/88 Pages) DALLAS

47 / 88 page

DS3141/DS3142/DS3143/DS3144 Single/Dual/Triple/Quad DS3/E3 Framers

47 of 88

BCR2

BERT Control Register 2

31h

Bit #

Name

N/A

PS2

PS1

PS0

RPL3

RPL2

RPL1

RPL0

Default

—

Bits 0 to 3: Repetitive Pattern Length (RPL[3:0]). RPL3 is the MSB and RPL0 is the LSB of a nibble that

describes how long the repetitive pattern is. The valid range is 17 (0000) to 32 (1111). These bits are ignored if the

BERT is programmed for a pseudorandom pattern or an alternating word pattern. To create repetitive patterns

fewer than 17 bits in length, the user must set the length to an integer multiple of the desired length that is less

than or equal to 32. For example, to create a 6-bit pattern, set the length to 18 (0001), 24 (0111), or 30 (1101).

Length

Code

Length

Code

Length

Code

Length

Code

17 bits

0000

18 bits

0001

19 bits

0010

20 bits

0011

21 bits

0100

22 bits

0101

23 bits

0110

24 bits

0111

25 bits

1000

26 bits

1001

27 bits

1010

28 bits

1011

29 bits

1100

30 bits

1101

31 bits

1110

32 bits

1111

Bits 4 to 6: Pattern Select (PS[2:0]). This field specifies the type of pattern to be generated. After configuring

these bits, the TC bit in the BCR1 register must be toggled to reconfigure the pattern generator.

PS[2:0]

PATTERN

TAPS

SPECIFICATION

TINV

RINV

000

Repetitive Pattern

—

001

Alternating Word Pattern

—

010

15 - 1

14, 15

ITU O.151 (for DS3)

011

20 - 1 QRSS

17, 20

T1.403

100

23 - 1

18, 23

ITU O.151 (for E3)

101

31 - 1

28, 31

(none)

110

Invalid

—

111

Invalid

—

BCR3

BERT Control Register 3

32h

Bit #

Name

N/A

EIB2

EIB1

EIB0

SBE

Default

—

Bit 0: Single Bit-Error Insert (SBE). A low-to-high transition creates a single bit error. Must be cleared and set

again for a subsequent bit error to be inserted.

Bits 1 to 3: Error Insert Bits (EIB[2:0]). Automatically insert bit errors at the prescribed rate into the generated

data pattern. Useful for verifying error detection operation.

EIB[2:0]

ERROR RATE INSERTED

000

No errors automatically inserted

001

–1 (1 error per 10 bits)

010

–2 (1 error per 100 bits)

011

–3 (1 error per 1000 bits)

100

–4 (1 error per 10,000 bits)

101

–5 (1 error per 100,000 bits)

110

–6 (1 error per 1,000,000 bits)

111

–7 (1 error per 10,000,000 bits)

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