參數(shù)資料
型號: DS3120
廠商: Maxim Integrated Products
文件頁數(shù): 67/133頁
文件大?。?/td> 0K
描述: IC FRAMER T1 28-CHAN 0-70C DEG
標準包裝: 1
控制器類型: T1 調(diào)幀器
接口: 并行/串行
電源電壓: 2.97 V ~ 3.63 V
電流 - 電源: 300mA
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 316-BGA
包裝: 管件
DS3112
39 of 133
Figure 4-3. Real-Time Status Bit
Internal Signal
Status Bit
Interrupt
Read
4.3.2 MSR
The Master Status Register (MSR) is a special status register that can be used to help the host quickly
locate changes in device status. There is a status bit in the MSR for each of the major blocks within the
DS3112. When an alarm or event occurs in one of these blocks, the device can be configured to set a bit
in the MSR. Status bits in the MSR can also cause a hardware interrupt to occur. In either polled or
interrupt driven software routines, the host can first read the MSR to locate which status registers need to
be serviced.
Register Name:
MSR
Register Description:
Master Status Register
Register Address:
08h
Bit #
7
6
5
4
3
2
1
0
Name
T2E2SR2
T2E2SR1
FEAC
HDLC
BERT
COVF
OST
Default
Bit #
15
14
13
12
11
10
9
8
Name
G.747
T3E3MS
LORC
LOTC
T3E3SR
T1LB
Default
Note: Bits that are underlined are read-only; all other bits are read-write.
Bit 0: One-Second Timer Boundary Occurrence (OST). This latched read-only event-status bit will be set to a
one on each one-second boundary as timed by the DS3112. The device chooses an arbitrary one-second boundary
that is timed from the HRCLK signal. This bit will be cleared when read and will not be set again until another
one-second boundary has occurred. The setting of this status bit can cause a hardware interrupt to occur if the OST
bit in the Interrupt Mask for MSR (IMSR) register is set to a one. The interrupt will be allowed to clear when this
bit is read.
Bit 1: Counter Overflow Event (COVF). This latched read-only event-status bit will be set to a one if any of the
error counters saturates (the error counters saturate when full). This bit will be cleared when read even if one or
more of the error counters is still saturated. The setting of this status bit can cause a hardware interrupt to occur if
the COVF bit in the Interrupt Mask for MSR (IMSR) register is set to a one. The interrupt will be allowed to clear
when this bit is read.
Bit 2: Change in BERT Status (BERT). This read-only real-time status bit will be set to a one if there is a major
change of status in the BERT receiver and the associated interrupt enable bit is set in the BERTCO register. A
major change of status is defined as either a change in the receive synchronization (i.e., the BERT has gone into or
out of receive synchronization), a bit error has been detected, or an overflow has occurred in either the Bit Counter
or the Error Counter. The host must read the status bits of the BERT in the BERT Status Register (BERTEC0) to
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