3.0 Registers
Bt8370/8375/8376
3.4 Interrupt Status Registers
Fully Integrated T1/E1 Framer and Line Interface
004—Alarm 1 Interrupt Status (ISR7)
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].
7
6
5
4
3
2
1
0
RMYEL
RYEL
RPDV
RAIS
RALOS
RLOS
RLOF
SIGFRZ
RMYEL
Loss/Recovery of Multiframe Yellow Alarm—Reports any change in real-time status of
Multiframe Yellow (E1) or ESF Yellow (T1) alarm detector.
0 = no event
1 = multiframe Yellow Alarm transition
RYEL
Loss/Recovery of Yellow Alarm—Reports any change in real-time status of Remote Alarm
Indication (RAI), also referred to as Yellow Alarm.
0 = no event
1 = Yellow Alarm transition
RPDV
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.
0 = no error
1 = receive pulse density violation
RAIS
Loss/Recovery of Alarm Indication Signal—Reports any change in real-time status of the AIS
detector.
0 = no event
1 = AIS transition
RALOS
RLOS
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).
0 = no event
1 = receive level transition
Loss/Recovery of Receive Signal—Reports any change in real-time status of digital receive
signal detector.
0 = no event
1 = receive signal transition
RLOF
Loss/Recovery of Frame Alignment—Reports any change in real-time or integrated status of
receive online frame status monitor.
0 = no event
1 = receive frame status transition
SIGFRZ
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.
0 = no event
1 = SIGFRZ transition
3-16
Conexant
N8370DSE
CONEXANT [ CONEXANT SYSTEMS, INC ]
