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XRT7250 Datasheet(PDF) 453 Page - Exar Corporation |
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XRT7250 Datasheet(HTML) 453 Page - Exar Corporation |
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453 / 463 page  XRT7250 áç áç áç áç DS3/E3 FRAMER IC REV. 1.1.1 434 Servicing the Change in Receive AIS Condition Interrupt 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 0 (AIS Interrupt Status), within the Rx E3 Interrupt Status Register - 1 to “1”, as indicated below. Whenever the user’s system encounters the Change in Receive AIS Condition Interrupt, then it should do the following. 1. It should determine the current state of the AIS condition. Recall, that this interrupt can be gen- erated, whenever the XRT7250 Framer IC declares or clears the AIS defect. Hence, the user can determine the current state of the AIS defect by reading the state of Bit 4 (RxAIS) within the Rx E3 Configuration and Status Register - 2, as illustrated below. If the AIS Condition is TRUE 1. It should begin transmitting the FERF indication to the Remote Terminal Equipment. The XRT7250 Framer IC automatically supports this action via the FERF-upon-AIS feature. If the AIS Condition is FALSE 2. It should cease transmitting the FERF indication to the Remote Terminal Equipment. The XRT7250 Framer IC automatically supports this action via the FERF-upon-AIS feature. 6.3.6.2.6 The Change in Trail Trace Buffer Mes- sage Interrupt If the Change in Trail Trace Buffer Message Interrupt has been enabled, then the XRT7250 Framer IC will generate an interrupt any time the Receive E3 Framer block receives a different Trail Trace Buffer message, then it has previously read in. Enabling and Disabling the Change in Trail Trace Buffer Message Interrupt. The user can enable or disable the Change in Trail Trace Buffer Message interrupt by writing the appro- priate value into Bit 6 (TTB Change Interrupt Enable) within the Rx E3 Interrupt Enable Register - 2, as indi- cated below. RXE3 INTERRUPT STATUS REGISTER - 1 (ADDRESS = 0X14) BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0 Not Used COFA Interrupt Status OOF Interrupt Status LOF Interrupt Status LOS Interrupt Status AIS Interrupt Status RO RO RO RUR RUR RUR RUR RUR 00 000 010 RXE3 CONFIGURATION & STATUS REGISTER 2 (ADDRESS = 0X11) BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0 Rx LOF Algo RxLOF RxOOF RxLOS RxAIS RxPld Unstab Rx TMark RxFERF R/W RORO RO RORORORO XX XXXX XX RXE3 INTERRUPT ENABLE REGISTER - 2 (ADDRESS = 0X13) BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0 Not Used TTB Change Interrupt Enable Not Used FEBE Interrupt Enable FERF Interrupt Enable BIP-8 Error Interrupt Enable Framing Byte Error Interrupt Enable RxPld Mis Interrupt Enable RO R/W RO R/W R/W R/W R/W R/W 00 00 X 000 |
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