BT8376EPF datasheet(175/323 Pages) CONEXANT

175 / 323 page

Bt8370/8375/8376

Fully Integrated T1/E1 Framer and Line Interface

3.8 Receiver Registers

N8370DSE

Conexant

3-57

049—Alarm 3 Status (ALM3)

Reports real-time status of the receive framer (not affected by ONESEC latch mode), and miscellaneous latched

error status (SEF and RMAIS). Any change of the logical OR of FRED, MRED, or SRED status activates the

RLOF interrupt [ISR7; addr 004]. Refer to Table 3-2, Receive Framer Modes [RFRAME; addr 001] to find the

criteria for loss/recovery of frame alignment.

RMAIS

Receive TS16 Alarm Indication Signal (CAS mode only)—RMAIS is latched active high and

cleared by a processor read. The criteria for detection and clearance of RMAIS is per ITU

G.775.

SEF

Severely Errored Frame—SEF is latched active high and cleared by a processor read. Criteria

for detection and clearance of SEF is per ANSI T1.231.

SRED

Loss of CAS Alignment—Real-time status of CAS alignment machine. SRED is applicable if

CAS is enabled; otherwise SRED is 0.

0 = recovery of CAS alignment

1 = loss of CAS alignment

MRED

Loss of MFAS Alignment—Real-time status of MFAS alignment machine. MRED is

applicable if MFAS is enabled; otherwise MRED is 0.

0 = recovery of MFAS alignment

1 = loss of MFAS alignment

FRED

Loss of T1/FAS Alignment—Real-time status of basic frame alignment machine. The FRED

alarm counter [AERR; addr 05A] increments for each low-to-high FRED transition.

0 = recovery of frame alignment

1 = loss of frame alignment.

LOF[1:0]

Reason for Loss of Frame Alignment—LOF status is latched whenever FRED reports a loss of

frame alignment and remains held at the latched value until the next loss of frame alignment.

—

RMAIS

SEF

SRED

MRED

FRED

LOF[1]

LOF[0]

Mode

RMAIS Criteria

CAS

Set if TS16 contains three or fewer zeros out of 128 bits in each

mutiframe over two consecutive multiframes (4 ms).

Other

Not applicable (read 0).

Mode

SEF Criteria

Set if two or more (FAS or NFAS) errors are detected out of six

frames. (FAS + NFAS, or 2 FAS, or 2 NFAS errors, etc.).

FT/SF/SLC

Set if two or more Ft errors are detected out of 3 Ft bits.

ESF

Set if two or more FPS errors detected out of 6 FPS bits.

LOF[1:0]

LOF Criteria

Three consecutive FAS pattern errors

Three consecutive NFAS pattern errors

915 or more CRC4 errors out of 1000 blocks checked

8 ms timeout while searching for MFAS

BT8376EPF Datasheet(PDF) 175 Page - Synaptics Incorporated.

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