BT8376EPF datasheet(140/323 Pages) CONEXANT

140 / 323 page

3.0 Registers

Bt8370/8375/8376

3.4 Interrupt Status Registers

Fully Integrated T1/E1 Framer and Line Interface

3-22

Conexant

N8370DSE

00B—Pattern Interrupt Status (ISR0)

All events in ISR0 are caused by rising edge sources. Each event is latched active-high and held until the

processor read clears ISR0. Each event triggers an interrupt if the corresponding IER0 bit is enabled [addr 013].

BSLIP

Online Framer Bit Slip—Active-high. Indicates that receive online framer adjusted receive

frame sync by

±1 bit. When BSLIP occurs, the apparent FAS error is not reported elsewhere

(not to FERR count, RLOF circuit, or SEF circuit). Applicable only to receive framer modes

with BSLIP enabled (see Table 3-2, Receive Framer Modes).

0 = no error

1 = frame bit slip

PSYNC

Receive PRBS Test Pattern Sync—Forced to inactive (low) status when the processor requests

RESEED [addr 041] of the PRBS sync detector, and remains low while detector searches for

test pattern sync. PRBS bit errors [BERR; addr 058, 059] are not counted while PSYNC is

low. PSYNC remains low for a minimum of 128 bits following RESEED, and for as long as

the received bit error ratio (BER) exceeds 1E-2. PSYNC is latched active (high) and the PRBS

sync detector stops searching when no bit errors are found for a period of 96 bits. The sync

detector remains disabled until the processor requests another RESEED. Therefore, any range

of BER can be measured after initial pattern sync. The processor must determine criteria for

loss of pattern sync based on its accumulation of bit errors over the desired time interval.

0 = no sync

1 = PRBS test pattern sync

TCERR

Transmit CRC Error—Reports occurrences of CRC-6 or CRC-4 errors detected on TPCMI

data according to the selected T1/E1 mode.

0 = no error

1 = CRC error

TSERR

Transmit CAS Error—Reports occurrences of MAS pattern errors detected on TPCMI data if

CAS transmit framer mode is selected.

0 = no error

1 = CAS error

TMERR

Transmit Multiframe Error—Reports occurrences of Fs or MFAS errors detected on TPCMI

data according to the selected transmit framer mode.

0 = no error

1 = transmit multiframe error

TFERR

Transmit Frame Error—Reports occurrences of Ft, FPS, or FAS errors detected on TPCMI

data according to the selected transmit framer mode.

——

BSLIP

PSYNC

TCERR

TSERR

TMERR

TFERR

BT8376EPF Datasheet(PDF) 140 Page - Synaptics Incorporated.

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