BT8376EPF datasheet(206/323 Pages) CONEXANT

206 / 323 page

Bt8370/8375/8376

3.15 Bit-Oriented Protocol Registers

Fully Integrated T1/E1 Framer and Line Interface

3-88

Conexant

N8370DSE

RBOP_INTEG

RBOP Integration—Requires receipt of two identical, consecutive 16-bit patterns (without

errors or gaps between patterns) to validate a single codeword. In this case, an errored

codeword does not increment the pattern count. RBOP integration must be enabled to meet

codeword detection criteria while receiving a 1E-3 bit error ratio. RBOP_INTEG adds at least

one to the number of successive 16-bit patterns needed to qualify receipt of BOP message (2 in

a row counts as 1 pattern; 11 in a row counts as 10; and 26 in a row counts as 25).

0 = no integration

1 = RBOP integrationRBOP_LEN[1:0]

RBOP Message Length—Selects the number of successive identical 16-bit patterns needed

to qualify receipt of a single BOP message and update RBOP [addr 0A2] with the received

codeword. During this time, the RBOP interrupt [ISR1; addr 00A] is also activated. Successive

patterns can be separated by any number of bits, as long as they do not contain a different valid

codeword.

TBOP_LEN[1:0]

TBOP Message Length—Selects the number of repeated 16-bit patterns sent as a single

message when a TBOP [addr 0A1] codeword is written. Another message with the same or

different codeword value can be written to TBOP as soon as prior message start is

acknowledged, via activation of a TBOP interrupt [ISR2; addr 009]. If no new message is

written, the FDL channel returns to TDL1 output control upon completion of message

transmission. The processor changes TBOP_LEN to end transmission of a continuously

repeating message.

RBOP_LEN

Successive Patterns

Notes

Single 16-bit pattern updates RBOP

Minimum command, response length

Preferred command, response length

Change

RBOP updates on receipt of each new

pattern

TBOP_LEN

Repeated

Patterns

Message

Length (ms)

Notes

Single message sends 16 FDL bits

Minimum command, response length

100

Preferred command

Continuous

Required for ESF Yellow Alarm

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