參數(shù)資料
型號(hào): DS3160
元件分類: 通信及網(wǎng)絡(luò)
英文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁數(shù): 35/107頁
文件大?。?/td> 592K
代理商: DS3160
DS3160
35 of 107
4.3 Master Status and Interrupt Register Descriptions
Status Registers
The status registers in the DS3160 allow the host to monitor the real-time condition of the device. Most of
the status bits in the device can cause a hardware interrupt to occur. Also, most of the status bits within
the device are latched to ensure that the host can detect changes in state and the true status of the device.
There are three types of status bits in the DS3160. The first type is called an event
status bit, which is
derived from a momentary condition or state that occurs within the device. The event status bits are
always cleared when read and can generate an interrupt when they are asserted. An example of an event
status bit is the one-second-timer boundary occurrence (OST).
The second type of status bit is called an alarm status bit, which is derived from conditions that can occur
for longer than an instance. The alarm status bits are cleared when read unless the alarm is still present.
The alarm status bits generate interrupts on a change in state in the alarm (i.e., when it is asserted or de-
asserted). An example of an alarm status bit is the loss of frame (LOF).
The third type of status bit is called a real-time status bit. The real-time status bit remains active as long as
the condition exists and generates an interrupt as long as the condition exists. An example of a real-time
status bit is the loss-of-transmit clock (LOTC).
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