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XRT7250 Datasheet(PDF) 452 Page - Exar Corporation |
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XRT7250 Datasheet(HTML) 452 Page - Exar Corporation |
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452 / 463 page  áç áç áç áç XRT7250 DS3/E3 FRAMER IC REV. 1.1.1 433 Writing a “1” into this bit-field enables the Change of Framing Alignment Interrupt. Conversely, writing a “0” into this bit-field disables the Change of Framing Alignment Interrupt. Servicing the Change of Framing Alignment 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 4 (COFA Interrupt Status), within the Rx E3 Interrupt Status Register -2, to “1”, as indi- cated below. 6.3.6.2.5 The Change in Receive AIS Condition Interrupt If the Change in Receive AIS 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 an AIS (Loss of Signal) Condition, and 2. When the XRT7250 Framer IC clears the AIS condition. Conditions causing the XRT7250 Framer IC to de- clare an AIS Condition. • If the XRT7250 Framer IC detects 7 or less “0” within 2 consecutive E3 frames. Conditions causing the XRT7250 Framer IC to clear the AIS Condition. • If the XRT7250 Framer IC detects 2 consecutive E3 frames that each contain 8 or more “0’s”. Enabling and Disabling the Change in Receive AIS Condition Interrupt The user can enable or disable the Change in Re- ceive LOS Condition Interrupt, by writing the appro- priate value into Bit 0 (AIS Interrupt Enable), within 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. 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 00 0 X 00 0 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 0010 000 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 |
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