BT8376EPF datasheet(168/323 Pages) CONEXANT

168 / 323 page

Bt8370/8375/8376

3.8 Receiver Registers

Fully Integrated T1/E1 Framer and Line Interface

3-50

Conexant

N8370DSE

042—Receive Loopback Code Detector Configuration (RLB)

DN_LEN[1:0]

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.

UP_LEN[1:0]

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.

043—Loopback Activate Code Pattern (LBA)

LBA[1]

First bit expected of LOOPUP pattern

LBA[2]

Second bit expected of LOOPUP pattern

LBA[3]

Third bit expected of LOOPUP pattern

LBA[4]

Fourth bit expected—Last bit if UP_LEN selects a 4-bit pattern.

LBA[5]

Fifth bit expected—Last bit if UP_LEN selects a 5-bit pattern.

LBA[6]

Sixth bit expected—Last bit if UP_LEN selects a 6-bit pattern.

LBA[7]

Seventh bit expected—Last bit if UP_LEN selects a 7-bit pattern.

————

DN_LEN[1]

DN_LEN[0]

UP_LEN[1]

UP_LEN[0]

DN_LEN

LBD Length

4 Bits

5 Bits

6 Bits

7 Bits

UP_LEN

LBA Length

4 Bits

5 Bits

6 Bits

7 Bits

LBA[1]

LBA[2]

LBA[3]

LBA[4]

LBA[5]

LBA[6]

LBA[7]

—

BT8376EPF Datasheet(PDF) 168 Page - Synaptics Incorporated.

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