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XRT75R12 Datasheet(PDF) 75 Page - Exar Corporation |
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XRT75R12 Datasheet(HTML) 75 Page - Exar Corporation |
75 / 89 page PRELIMINARY XRT75R12 TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR REV. P1.0.2 72 3 FL Alarm Declared R/O FL (FIFO Limit) Alarm Declared: This READ-ONLY bit-field indicates whether or not the Jitter Attenuator block (within Channel_n) is currently declaring the FIFO Limit Alarm. The Jitter Attenuator block will declare the FIFO Limit Alarm anytime the Jitter Attenuator FIFO comes within two bit-periods of either over- flowing or under-running. Conversely, the Jitter Attenuator block will clear the FIFO Limit Alarm anytime the Jitter Attenuator FIFO is NO longer within two bit-periods of either overflowing or under-running. Typically, this Alarm will only be declared whenever there is a very seri- ous problem with timing or jitter in the system. 0 - Indicates that the Jitter Attenuator block (within Channel_n) is NOT currently declaring the FIFO Limit Alarm condition. 1 - Indicates that the Jitter Attenuator block (within Channel_n) is cur- rently declaring the FIFO Limit Alarm condition. NOTE: This bit-field is only active if the Jitter Attenuator (within Channel_n) has been enabled. 2 Receive LOL Con- dition Declared R/O Receive LOL (Loss of Lock) Condition Declared: This READ-ONLY bit-field indicates whether or not the Receive Sec- tion (within Channel_n) is currently declaring the LOL (Loss of Lock) condition. The Receive Section (of Channel_n) will declare the LOL Condition, if the frequency of the Recovered Clock signal differs from that of the ref- erence clock programmed for that channel (from the appropriate oscil- lator or the SFM clock synthesizer if in that mode) by 0.5% (or 5000ppm) or more . 0 - Indicates that the Receive Section of Channel_n is NOT currently declaring the LOL Condition. 1 - Indicates that the Receive Section of Channel_n is currently declar- ing the LOL Condition and the recovered clock differs by more than 0.5%.. BIT NUMBER NAME TYPE DESCRIPTION |
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