3.0 Registers
Bt8370/8375/8376
3.4 Interrupt Status Registers
Fully Integrated T1/E1 Framer and Line Interface
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].
7
6
5
4
3
2
1
0
—
—
BSLIP
PSYNC
TCERR
TSERR
TMERR
TFERR
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
TSERR
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
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
TFERR
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
Transmit Frame Error—Reports occurrences of Ft, FPS, or FAS errors detected on TPCMI
data according to the selected transmit framer mode.
3-22
Conexant
N8370DSE
CONEXANT [ CONEXANT SYSTEMS, INC ]
