Bt8370/8375/8376
3.0 Registers
Fully Integrated T1/E1 Framer and Line Interface
3.4 Interrupt Status Registers
005—Alarm 2 Interrupt Status (ISR6)
All events reported in ISR6 are from dual-edge sources, except the 1-second timer [ONESEC] and Transmit
Pulse Density Violation [TPDV]. Any transition of real-time status in the Alarm 2 Status register [ALM2;
addr 048] forces the corresponding ISR6 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 IER6 bit is
enabled [addr 00D].
7
6
5
4
3
2
1
0
LOOPDN
LOOPUP
TPDV
TSHORT
TLOC
—
TLOF
ONESEC
LOOPDN
Loss/Recovery of Inband Loopback Deactivate Code—Reports any change in real-time status
of inband loopback deactivate code detector.
0 = no event
1 = LOOPDN code transition
LOOPUP
TPDV
Loss/Recovery of Inband Loopback Activate Code—Reports any change in real-time status of
inband loopback activate code detector.
0 = no event
1 = LOOPUP code transition
Transmit PDV Monitor/Enforcer—Applicable only if TZCS [addr 071] enables PDV
enforcement. When enabled, TPDV is latched active if 1 or more PDV-enforced 1s were
output to meet ANSI T1.403 minimum pulse density requirements.
0 = no error
1 = PDV-enforced 1
TSHORT
TLOC
Loss/Recovery of Transmit Short Circuit—Reports any change in real-time status of transmit
line driver's short circuit detector.
0 = no alarm
1 = short circuit transition
Loss/Recovery of Transmit Clock—Reports any change in real-time status of TCKI clock
monitor.
0 = no alarm
1 = clock monitor transition
TLOF
Loss/Recovery of Transmit Frame Alignment—Reports any change in real-time status of
transmit framer's basic alignment.
0 = no alarm
1 = transmit framer transition
ONESEC
1-second Timer Event—ONESEC is derived from the internal 1-second timer or the rising
edge of ONESEC input signal, according to the selected I/O mode [PIO; addr 018].
0 = no timer event
1 = ONESEC timer expired or rising edge of ONESEC input
N8370DSE
Conexant
3-17
CONEXANT [ CONEXANT SYSTEMS, INC ]
