参数资料
型号: WJLXT384LEB1
厂商: CORTINA SYSTEMS INC
元件分类: 数字传输电路
英文描述: DATACOM, PCM TRANSCEIVER, PQFP144
封装: 20 X 20MM, ROHS COMPLIANT, LQFP-144
文件页数: 113/140页
文件大小: 1514K
代理商: WJLXT384LEB1
74
Document Number: 248994
Revision Number: 005
Revision Date: November 28, 2005
Intel LXT384 Octal T1/E1/J1 S/H PCM Transceiver with JA
7.5
Interrupt Handling
7.5.1
Interrupt Sources
Interrupt sources include the following:
1. Status change in the LOS (Loss of Signal) Status register (04h, Table 32). The LXT384
Transceiver continuously monitors the receiver signal and updates the specific LOS status bit
to indicate either the presence or absence of an LOS condition.
2. Status change in the AIS (Alarm Indication Signal) Status register (13h, Table 47). The LOS
(Loss of Signal) Status register (04h, Table 32). The LOS (Loss of Signal) Status register (04h,
Table 32). The LXT384 Transceiver monitors the incoming data stream and updates the
specific AIS status bit to indicate either the presence or absence of a AIS condition.
7.5.2
Interrupt Enable
The LXT384 Transceiver provides a latched interrupt output (INT). An interrupt occurs any time
there is a transition on any enabled bit in the corresponding status register.
Register 06h (Table 34) is the LOS Interrupt Enable register, and register 14h (Table 48) is the AIS
Interrupt Enable register. Writing a logic ‘1’ into the corresponding mask register enables a bit in
the corresponding interrupt status register to generate an interrupt. The power-on default value is
all zeroes. The setting of the interrupt enable bit does not affect the operation of the status registers.
Register 08h (Table 36) is the LOS Interrupt Status register, and register 15h (Table 49) is the RAIS
Interrupt Status register. When there is a transition on any enabled bit in a status register, the
associated bit of the interrupt status register is set and an interrupt is generated (if one is not already
pending). When an interrupt occurs, the INT pin is asserted low. The output circuitry of the INT pin
consists of an active pull-down device (an open drain). An external pull-up resistor of
approximately 10k
Ω is required to support wired-OR operation with other LXT384 Transceivers.
7.5.3
Interrupt Clear
When an interrupt occurs, the interrupt service routine (ISR) operates as follows:
1. The ISR must read the interrupt status registers (08h and 15h) to identify the interrupt source.
2. The ISR must then read the corresponding status monitor register to obtain the current status of
the LXT384 Transceiver.
Note:
Reading an interrupt-status register clears the ‘sticky’ status bit set by the interrupt. (A ‘sticky’
status bit is a bit that, once set, remains set until it is explicitly cleared.) Automatically clearing
an interrupt-status register prepares the register for the next interrupt.
The status-monitor registers are the LOS Status register (04h, Table 32)and the AIS Status
register (13h, Table 47). Reading a status-monitor register clears its corresponding interrupts
on the rising edge of the read or data strobe. When all pending interrupts are cleared, the signal
on INT goes high.
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WJLXT385LEB1 DATACOM, PCM TRANSCEIVER, PQFP144
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