bt8375kpf Conexant Systems, Inc., bt8375kpf Datasheet - Page 168

• Manufacturer Part Number: bt8375kpf
• Description: Single Chip Transceivers For T1/e1 And Integrated Service Digital Network Isdn Primary Rate Interfaces Systems
• Manufacturer: Conexant Systems, Inc.

3.8 Receiver Registers
DN_LEN[1:0]
UP_LEN[1:0]
LBA[1]
LBA[2]
LBA[3]
LBA[4]
LBA[5]
LBA[6]
LBA[7]
3-50
042— Receive Loopback Code Detector Configuration (RLB)
043— Loopback Activate Code Pattern (LBA)
LBA[1]
—
7
7
Loopback Deactivate Code Length—Selects the number of loopback pattern bits from LBD
[addr 044] that are compared to received data to determine it a Loopback Deactivate Code
[LOOPDN; addr 048] is detected. LOOPDN is recovered if the received data pattern contains
fewer than 63 bit errors in a 24 ms period. LOOPDN is lost if 64 or more bit errors are detected
in a subsequent 24 ms period. F-bits that overwrite or are inserted into the loopback pattern are
not counted as bit errors. Accurate code detection is provided on lines with up to 1E-3 BER.
Loopback Activate Code Length—Selects the number of loopback pattern bits from LBA
[addr 043] that are compared with received data to determine if a Loopback Activate Code
[LOOPUP; addr 048] is detected. LOOPUP is recovered if received data pattern contains
fewer than 63 bit errors in a 24 ms period. LOOPUP is lost if 64 or more bit errors are detected
in a subsequent 24 ms period. F-bits that overwrite or are inserted into the loopback pattern are
not counted as bit errors. Accurate code detection is provided on lines with up to 1E-3 BER.
First bit expected of LOOPUP pattern
Second bit expected of LOOPUP pattern
Third bit expected of LOOPUP pattern
Fourth bit expected—Last bit if UP_LEN selects a 4-bit pattern.
Fifth bit expected—Last bit if UP_LEN selects a 5-bit pattern.
Sixth bit expected—Last bit if UP_LEN selects a 6-bit pattern.
Seventh bit expected—Last bit if UP_LEN selects a 7-bit pattern.
LBA[2]
—
6
6
LBA[3]
—
5
5
DN_LEN
UP_LEN
LBA[4]
00
01
10
11
00
01
10
11
—
4
4
Conexant
DN_LEN[1]
LBA[5]
LBD Length
LBA Length
3
3
Fully Integrated T1/E1 Framer and Line Interface
4 Bits
5 Bits
6 Bits
7 Bits
4 Bits
5 Bits
6 Bits
7 Bits
DN_LEN[0]
LBA[6]
2
2
UP_LEN[1]
LBA[7]
Bt8370/8375/8376
1
1
N8370DSE
UP_LEN[0]
—
0
0