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XRT7250 Datasheet(PDF) 244 Page - Exar Corporation |
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XRT7250 Datasheet(HTML) 244 Page - Exar Corporation |
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244 / 463 page  áç áç áç áç DS3/E3 FRAMER IC XRT7250 REV. 1.1.1 225 2. It should transmit the appropriate FEAC Message (per Bellcore GR-499-CORE), to the Remote Ter- minal Equipment, indicating that the Service Affecting condition has been cleared. 4.3.6.2.3 The Change of State of Receive AIS Interrupt If the Change of State on Receive AIS (Alarm Indica- tion Signal) Interrupt is enabled, then the XRT7250 Framer IC will generate an interrupt in response to ei- ther of the following conditions. 1. When the XRT7250 Framer IC detects an AIS pattern, in the incoming DS3 data stream, and 2. When the XRT7250 Framer IC no longer detects the AIS pattern in the incoming DS3 data stream. Conditions causing the XRT7250 Framer IC to de- clare an AIS condition • If the Receive DS3 Framer block (within the XRT7250 Framer IC) detects at least 63 DS3 frames, which contains the AIS pattern. Conditions causing the XRT7250 Framer IC to clear the AIS condition. • Whenever, the Receive DS3 Framer block detects 63 DS3 frames, which do not contain the AIS pat- tern. Enabling and Disabling the Change of State on Receive AIS Interrupt: The user can enable or disable the Change of State on Receive AIS Interrupt, by writing the appropriate value into Bit 5 (AIS Interrupt Enable) within the RxDS3 Interrupt Enable Register, as illustrated below. Setting this bit-field to “1” enables this interrupt. Con- versely, setting this bit-field to “0” disables this inter- rupt. Servicing the Change of State on Receive AIS In- terrupt Whenever the XRT7250 Framer IC detects this inter- rupt, it will do all of the following. • It will assert the Interrupt Request output pin (INT) by driving it "Low". • It will set Bit 5 (AIS Interrupt Status) within the RxDS3 Interrupt Status Register, to “1”, as indi- cated below. Whenever the Terminal Equipment encounters a Change in AIS on Receive interrupt, it should do the following. 1. It should determine the current state of the AIS condition. Recall, that this interrupt can gener- ated, whenever the XRT7250 Framer declares or clears the AIS defects. Hence, the user can determine the current state of the AIS defect by reading the state of Bit 7 (RxAIS), within the RxDS3 Configuration & Status Registers, as illus- trated below RXDS3 INTERRUPT ENABLE REGISTER (ADDRESS = 0X12) BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0 CP Bit Error Interrupt Enable LOS Interrupt Enable AIS Interrupt Enable Idle Interrupt Enable FERF Interrupt Enable AIC Interrupt Enable OOF Interrupt Enable P-Bit Error Interrupt Enable R/W R/W R/W R/W R/W R/W R/W R/W 0 0000 000 RXDS3 INTERRUPT STATUS REGISTER (ADDRESS = 0X13) BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0 CP-Bit Error Interrupt Status LOS Interrupt Status AIS Interrupt Status Idle Interrupt Status FERF Interrupt Status AIC Interrupt Status OOF Interrupt Status P-Bit Error Interrupt Status RUR RUR RUR RUR RUR RUR RUR RUR 0 0100 000 |
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