BT8375 CONEXANT [Conexant Systems, Inc], BT8375 Datasheet - Page 206

• Manufacturer Part Number: BT8375
• Description: single chip transceivers for T1/E1 and Integrated Service Digital Network (ISDN) primary rate interfaces
• Manufacturer: CONEXANT [Conexant Systems, Inc]

3.15 Bit-Oriented Protocol Registers
RBOP_INTEG
TBOP_LEN[1:0]
3-88
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).
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 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 Message Length—Selects the number of successive identical 16-bit patterns needed
TBOP_LEN
RBOP_LEN
00
01
10
11
00
01
10
11
0 = no integration
1 = RBOP integrationRBOP_LEN[1:0]
Continuous
Repeated
Patterns
Successive Patterns
10
25
Conexant
1
Change
10
25
1
Length (ms)
Continuous
Message
100
Fully Integrated T1/E1 Framer and Line Interface
40
4
Single 16-bit pattern updates RBOP
Minimum command, response length
Preferred command, response length
RBOP updates on receipt of each new
pattern
Single message sends 16 FDL bits
Minimum command, response length
Preferred command
Required for ESF Yellow Alarm
Notes
Notes
Bt8370/8375/8376
N8370DSE