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XRT7250 Datasheet(PDF) 450 Page - Exar Corporation |
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XRT7250 Datasheet(HTML) 450 Page - Exar Corporation |
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450 / 463 page  áç áç áç áç XRT7250 DS3/E3 FRAMER IC REV. 1.1.1 431 the RxE3 Interrupt Enable Register - 1, as indicated 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 in Receive OOF 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 3 (OOF 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 OOF Condition Interrupt, then it should do the following. 1. It should determine the current state of the OOF condition. Recall, that this interrupt can be gen- erated, whenever the XRT7250 Framer IC declares or clears the OOF defect. Hence, the user can determine the current state of the LOS defect by reading the state of Bit 5 (RxOOF) within the Rx E3 Configuration and Status Regis- ter - 2, as illustrated below. If the OOF state is TRUE 1. It should transmit a FERF (Far-End-Receive Fail- ure) indicator to the Remote Terminal Equipment. The XRT7250 Framer IC automatically supports this action via the FERF-upon-OOF feature. If the OOF state is FALSE 1. It should cease transmitting the FERF indication to the Remote Terminal Equipment. The XRT7250 Framer IC automatically supports this action via the FERF-upon-OOF feature. 6.3.6.2.3 The Change in Receive LOF Condi- tion Interrupt If the Change in Receive LOF Condition Interrupt is enabled, then the XRT7250 Framer IC will generate an interrupt in response to either of the following con- ditions. RXE3 INTERRUPT ENABLE REGISTER - 1 (ADDRESS = 0X12) BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0 Not Used COFA Interrupt Enable OOF Interrupt Enable LOF Interrupt Enable LOS Interrupt Enable AIS Interrupt Enable RO RO RO R/W R/W R/W R/W R/W 0 0000 0 X 0 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 0 0000 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 |
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