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XRT7250 Datasheet(PDF) 346 Page - Exar Corporation |
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XRT7250 Datasheet(HTML) 346 Page - Exar Corporation |
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346 / 463 page  áç áç áç áç XRT7250 DS3/E3 FRAMER IC REV. 1.1.1 327 tion, it will still rely on the old framing alignment for E3 payload data extraction, etc. However, if the Receive E3 Framer had to change alignment, in order to re-acquire frame synchroniza- tion, then this interrupt will occur. Enabling and Disabling the Change of Framing Alignment Interrupt The user can enable or disable the Change of Fram- ing Alignment Interrupt by writing the appropriate val- ue into Bit 4 (COFA Interrupt Enable), within the Rx E3 Interrupt Enable Register - 1. 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 Inter- rupt 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 -1, to “1”, as indi- cated below. 5.3.6.2.6 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 “A” bit 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 “A” 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 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 |
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