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XRT7250 Datasheet(PDF) 454 Page - Exar Corporation |
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XRT7250 Datasheet(HTML) 454 Page - Exar Corporation |
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454 / 463 page  áç áç áç áç XRT7250 DS3/E3 FRAMER IC REV. 1.1.1 435 Writing a “1” into this bit-field enables the Change in Trail Trace Buffer Message Interrupt. Conversely, writing a “0” into this bit-field disables the Change in Trail Trace Buffer Message Interrupt. Servicing the Change in Trail Trace Buffer Mes- sage Interrupt Whenever the XRT7250 Framer IC generates this in- terrupt, it will do the following. • It will assert the Interrupt Request output pin (INT) by driving it “Low”. • It will set Bit 6 (TTB Change Interrupt Status), within the Rx E3 Interrupt Status Register - 2, as indicated below. • It will write the contents of this newly received Trail Trace Buffer Message, into the RxTTB-0 (located at 0x1C) through RxTTB-15 (located at 0x2B) regis- ters. Whenever the Terminal Equipment encounters the Change in Trail Trace Buffer Message Interrupt, then it should read out the contents of the 16 RxTTB regis- ters. 6.3.6.2.7 The Change in Receive FERF Condi- tion Interrupt If the Change in Receive FERF Condition Interrupt is enabled, then the XRT7250 Framer IC will generate an interrupt in response to either of the following con- ditions. 1. When the XRT7250 Framer IC declares a FERF (Far-End Receive Failure) Condition, and 2. When the XRT7250 Framer IC clears the FERF condition. Conditions causing the XRT7250 Framer IC to de- clare an FERF Condition. • If the XRT7250 Framer IC begins receiving E3 frames which have the FERF bit (within the MA byte, set to “1”). Conditions causing the XRT7250 Framer IC to clear the AIS Condition. • If the XRT7250 Framer IC begins receiving E3 frames that do NOT have the FERF bit set to “1”. Enabling and Disabling the Change in Receive AIS Condition Interrupt The user can enable or disable the Change in Re- ceive FERF Condition Interrupt, by writing the appro- priate value into Bit 3 (FERF Interrupt Enable), within the RxE3 Interrupt Enable Register - 2, 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 FERF 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 (FERF Interrupt RXE3 INTERRUPT STATUS REGISTER - 2 (ADDRESS = 0X15) BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0 Not Used TTB Change Interrupt Status Not Used FEBE Interrupt Status FERF Interrupt Status BIP-8 Error Interrupt Status Framing Byte Error Interrupt Status RxPld Mis Interrupt Status RO RUR RO RUR RUR RUR RUR RUR 0 1000 000 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 0 000 X 000 |
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