BT8376EPF datasheet(166/323 Pages) CONEXANT

166 / 323 page

Bt8370/8375/8376

3.8 Receiver Registers

Fully Integrated T1/E1 Framer and Line Interface

3-48

Conexant

N8370DSE

RLOFD–RLOFA

RX Reframe Criteria—Determines the number of frame errors the online framer must detect

before declaring a loss of frame alignment [ALM1; addr 047]. Refer to the Receive Framer

mode in [RFRAME; addr 001] (Table 2-3, Criteria for Loss/Recovery of Receive Framer

Alignment) to find which frame bits are monitored.

RZCS

Receive B8ZS/HDB3 Zero Code Substitution (affects only BPV/LCV/EXZ counting)—When

set, the ZCS decoder does not include bipolar violations received as part of a B8ZS/HDB3

code in the LCV error count [addr 054, 055]. Otherwise, all bipolar violations are counted.

EXZ detection criteria is either 8 or 16 consecutive zeros, depending on the RZCS

configuration.

0 = ZCS decoder reports all occurrences of BPV;

also selects EXZ = 16 zeros

1 = ZCS decoder does not report BPVs received as part of ZCS;

also selects EXZ = 8 zeros

041—Receive Test Pattern Configuration (RPATT)

RESEED

Re-seed PRBS Sync Detector (auto clear)—If BSTART is active high, writing a one to

RESEED forces the PRBS sync detector to reseed and search for test pattern sync [PSYNC;

addr 00B]. The reseed and search algorithm remains active until a test pattern sync is found.

0 = no effect

1 = reseed and search for test pattern sync

When inverted data mode is selected, initiating RESEED [RPATT; addr 041] while

receiving all 1s will cause false pattern sync. In such cases, check receive slip buffers to see if

not all 1s is being received, then re-enable RESEED.

BSTART

Enable PRBS Detector and Start Counting PRBS Bit Errors—BERR [addr 058, 059] counting

is enabled when BSTART is active high and a pattern sync is found [PSYNC=1; addr 00B];

otherwise, the BERR counter holds its present value until cleared by a processor read.

0 = PRBS detector disabled and BERR stops counting

1 = enable PRBS detector and BERR counter

T1/E1N

RLOFD–A

Reframe Criteria

0100

3 Consecutive FAS or 915 CRC errors

1100

3 Consecutive FAS Errors

0001

2 out of 4 F-bit errors

0010

2 out of 5 F-bit errors

0100

2 out of 6 F-bit errors

NOTE:

Other RLOFD–RLOFA combinations are invalid. RAIS and

RLOF status is disabled if RLOFD–RLOFA equal all zeros.

——

RESEED

BSTART

FRAMED

ZLIMIT

RPATT[1]

RPATT[0]

BT8376EPF Datasheet(PDF) 166 Page - Synaptics Incorporated.

BT8376EPF Datasheet(HTML) 166 Page - Synaptics Incorporated.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL