BT8375 CONEXANT [Conexant Systems, Inc], BT8375 Datasheet - Page 139

• Manufacturer Part Number: BT8375
• Description: single chip transceivers for T1/E1 and Integrated Service Digital Network (ISDN) primary rate interfaces
• Manufacturer: CONEXANT [Conexant Systems, Inc]

Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
All events in ISR1 are from rising edge sources. Each event is latched active-high and held until the processor
read clears ISR1. Each event triggers an interrupt if the corresponding IER1 bit is enabled [addr 012].
RBOP
RFULL2
RNEAR2
RMSG2
TDLERR2
TEMPTY2
TNEAR2
TMSG2
N8370DSE
00A—Data Link 2 Interrupt Status (ISR1)
RBOP
RBOP
7
7
BOP Codeword Received
in the RBOP register [addr 0A2].
Receive FIFO Full
write received data to a full FIFO causing the receive data link FIFO to overrun. In
unformatted modes (Pack6 and Pack8), RFULL is set when the receive FIFO is filled to the
MSG_FILL limit selected in register RDL2_FFC [addr 0B2].
Receive FIFO Near Full
selected in register RDL2_FFC [addr 0B2].
Message Received
available in the receiver FIFO.
Transmit FIFO Error
the FIFO without encountering an end of message [TDL2_EOM; addr 0B7]. The underrun
condition also forces transmission of an HDLC abort code.
Transmit FIFO Empty
write to a full FIFO. Overflow data is ignored by the transmit FIFO.
Transmit FIFO Near Empty
selected in register TDL2_FEC [addr 0B6].
Message Transmitted
is just beginning transmission.
RFULL2
—
6
6
RNEAR2
—
5
5
—
—
In HDLC modes, RFULL is set when the data link receiver attempts to
Set when a complete message or a partial message is received and
—
—
—
Set when the FIFO underruns as a result of the internal logic emptying
Set when a complete message has been transmitted and the closing flag
—
Set when the FIFO overflows as a result of the processor attempting to
—
Set when the receive FIFO fill level reaches the near full threshold
—
Set when a valid Bit Oriented Codeword is received and available
For Bt8370 and Bt8375
RMSG2
Set when the transmit FIFO level falls below the threshold
—
4
4
Conexant
For Bt8376
TDLERR2
—
3
3
TEMPTY2
—
2
2
3.4 Interrupt Status Registers
TNEAR2
—
1
1
3.0 Registers
TMSG2
—
0
0
3-21