XRT83SH314 Просмотр технического описания (PDF) - Exar Corporation

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XRT83SH314

14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

Exar Corporation 

XRT83SH314

14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

REV. 1.0.4

2.2.2 Interference Margin

The interference margin for the XRT83SH314 will be added when the first revision of silicon arrives. The test

configuration for measuring the interference margin is shown in Figure 9.

FIGURE 9. TEST CONFIGURATION FOR MEASURING INTERFERENCE MARGIN

E1 = 1,024kHz

T1 = 772kHz

Sinewave

Generator

E1 = PRBS 215 - 1

T1 = PRBS 223 - 1

W&G ANT20 Tx

Network

Analyzer

Rx

Flat Loss

Cable Loss

Rx

External Loopback

XRT83SH314

Tx

14-Channel LIU

2.2.3 General Alarm Detection and Interrupt Generation

The receive path detects RLOS, AIS, QRPD and FLS. These alarms can be individually masked to prevent the

alarm from triggering an interrupt. To enable interrupt generation, the Global Interrupt Enable (GIE) bit must be

set "High" in the appropriate global register. Any time a change in status occurs (it the alarms are enabled), the

interrupt pin will pull "Low" to indicate an alarm has occurred. Once the status registers have been read, the

INT pin will return "High". The status registers are Reset Upon Read (RUR). The interrupts are categorized in

a hierarchical process block. Figure 10 is a simplified block diagram of the interrupt generation process.

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