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XRT7250 Datasheet(PDF) 243 Page - Exar Corporation |
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XRT7250 Datasheet(HTML) 243 Page - Exar Corporation |
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243 / 463 page  XRT7250 DS3/E3 FRAMER IC áç áç áç áç REV. 1.1.1 224 value into Bit 1 (OOF 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 OOF 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 this pin "Low". • It will set Bit 1 (OOF Interrupt Status), within the RxDS3 Interrupt Status Register to “1”, as indicated below. Whenever the Terminal Equipment encounters a Change in OOF on Receive Interrupt, then it should do the following. 1. It should determine the current state of the OOF condition. Recall, that this interrupt can gener- ated, whenever the XRT7250 Framer declares or clears the OOF defects. Hence, the user can determine the current state of the OOF defect by reading the state of Bit 4 (RxOOF), within the RxDS3 Configuration & Status Registers, as illus- trated below. If OOF is TRUE. 1. It should transmit a FERF (Far-End Receive Fail- ure) to the Remote Terminal Equipment. The XRT7250 Framer IC automatically supports this action via the FERF-upon-OOF feature. 2. It should transmit the appropriate FEAC Message (per Bellcore GR-499-CORE), to the Remote Ter- minal, indicating that a Service Affecting condi- tion has been detected in the Local Terminal Equipment. if OOF is FALSE 1. It should cease transmitting a FERF (Far-End Receive Failure) indicator to the Remote Terminal Equipment. The XRT7250 Framer IC automati- cally supports this action via the FERF-upon- OOF feature. 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 00 000 000 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 RURRUR RUR RUR RURRUR RURRUR 00 000 010 RXDS3 CONFIGURATION & STATUS REGISTER (ADDRESS = 0X10) BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0 RxAIS RxLOS RxIdle RxOOF Reserved Framing On Parity FSync Algo MSync Algo RO RO RO RO RO RO RO RUR 00 000 000 |
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