BT8375 CONEXANT [Conexant Systems, Inc], BT8375 Datasheet - Page 134

• 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]

3.0 Registers
3.4 Interrupt Status Registers
All events reported in ISR7 are from dual-edge sources, except Receive Pulse Density Violation [RPDV]. Any
transition of real-time status in Alarm 1 Status register [ALM1; addr 047] forces the corresponding ISR7 status
bit active (high). Active-high status is latched and held according to the LATCH_ALM bit [addr 046]. Each
event triggers an interrupt if the corresponding IER7 bit is enabled [addr 00C].
RMYEL
RYEL
RPDV
RAIS
RALOS
RLOS
RLOF
SIGFRZ
3-16
004—Alarm 1 Interrupt Status (ISR7)
RMYEL
7
Loss/Recovery of Multiframe Yellow Alarm—Reports any change in real-time status of
Multiframe Yellow (E1) or ESF Yellow (T1) alarm detector.
Loss/Recovery of Yellow Alarm—Reports any change in real-time status of Remote Alarm
Indication (RAI), also referred to as Yellow Alarm.
Receive Pulse Density Violation—Reports each occurrence of a receive pulse density
violation, according to ANSI T1.403 sliding window criteria. RPDV is latched active upon
detection of any window of 8 (N+1) bits which does not contain at least N pulses. For
example, RPDV reports each occurrence of 16 consecutive 0s.
Loss/Recovery of Alarm Indication Signal—Reports any change in real-time status of the AIS
detector.
Loss/Recovery of Receive Analog Signal—Reports any change in analog receive level
detector’s real-time status, or receive equalizer’s acquisition status (ACQUIRE; addr 021).
Loss/Recovery of Receive Signal—Reports any change in real-time status of digital receive
signal detector.
Loss/Recovery of Frame Alignment—Reports any change in real-time or integrated status of
receive online frame status monitor.
Loss/Recovery of Signaling Freeze—Reports any change in real-time status of SIGFRZ
receiver status, which is also available on the SIGFRZ output pin.
RYEL
6
RPDV
5
0 = no event
1 = multiframe Yellow Alarm transition
0 = no event
1 = Yellow Alarm transition
0 = no error
1 = receive pulse density violation
0 = no event
1 = AIS transition
0 = no event
1 = receive level transition
0 = no event
1 = receive signal transition
0 = no event
1 = receive frame status transition
0 = no event
1 = SIGFRZ transition
RAIS
4
Conexant
RALOS
3
Fully Integrated T1/E1 Framer and Line Interface
RLOS
2
RLOF
Bt8370/8375/8376
1
N8370DSE
SIGFRZ
0