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XRT7250 Datasheet(PDF) 312 Page - Exar Corporation |
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XRT7250 Datasheet(HTML) 312 Page - Exar Corporation |
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312 / 463 page  áç áç áç áç XRT7250 DS3/E3 FRAMER IC REV. 1.1.1 293 Writing a “0” into this bit-field causes the Receive E3 Framer block to reside in the OOF Condition state for at most 24 E3 frame periods. Writing a “1” into this bit-field causes the Receive E3 Framer block to reside in the OOF Condition state for at most 8 E3 frame pe- riods. LOF (Loss of Framing) Condition State If the Receive E3 Framer block enters the LOF Condi- tion state, then the following things will happen. • The Receive E3 Framer block will discard the most recent frame synchronization and, • The Receive E3 Framer block will make an uncon- ditional transition to the FAS Pattern Search state. • The Receive E3 Framer block will notify the Micro- processor/Microcontroller of its transition to the LOF Condition state, by generating the Change in LOF Condition interrupt. When this occurs, Bit 2 (LOF Interrupt Status), within the Rx E3 Interrupt Status Register - 1 will be set to “1”, as depicted below. Finally, the Receive E3 Framer block will also inform the external circuitry of this transition to the LOF Con- dition state by toggling the RxLOF output pin "High”. 5.3.2.2 The Framing Maintenance Mode Once the Receive E3 Framer block enters the In- Frame state, then it will notify the Microprocessor/Mi- crocontroller of this fact by generating both the Change in OOF Condition and Change in LOF Condi- tion Interrupts. When this happens, bits 2 and 3 (LOF Interrupt Status and OOF Interrupt Status) will be set to “1”, as depicted below. Additionally, the Receive E3 Framer block will inform the external circuitry of its transition to the In-Frame state by toggling both the RxOOF and RxLOF output pins "Low”. Finally, the Receive E3 Framer block will negate both the RxOOF and the RxLOF bit-fields within the Rx E3 Configuration & Status Register, as depicted below. RXE3 CONFIGURATION & STATUS REGISTER - 2 (ADDRESS = 0X11) BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0 RxLOF Algo RxLOF RxOOF RxLOS RxAIS Not Used RxFERF R/W RORO RO RORORORO 0 1100 111 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 100 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 0001 100 |
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