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TLK2201JR Datasheet(PDF) 7 Page - Texas Instruments |
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TLK2201JR Datasheet(HTML) 7 Page - Texas Instruments |
7 / 20 page TLK2201JR 1.0 Gb to 1.6 Gb SMALL FORMFACTOR ETHERNET TRANSCEIVER SCAS652F − AUGUST 2000 − REVISED MAY 2007 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 comma character not on expected boundary (continued) DXX.X K28.5 DXX.X DXX.X K28.5 K28.5 DXX.X DXX.X DXX.X DXX.X DXX.X K28.5 DXX.X DXX.X K28.5 K28.5 DXX.X DXX.X 31 Bit Times Max Receive Path Latency Worst Case Misaligned K28.5 Misalignment Corrected INPUT DATA RBC0 RBC1 RD(0−9) SYNC Corrupt Data 30 Bit Times (Max) Figure 5. Word Realignment Timing Characteristics Waveforms Systems that do not require framed data may disable byte alignment by tying SYNCEN low. When a SYNC character is detected, the SYNC signal is brought high and is aligned with the K28.5 character. The duration of the SYNC pulse is equal to the duration of the data when in TBI mode. When in DDR mode the SYNC pulse is present for the entire RBC0 period. data reception latency The serial to parallel data latency is the time from when the first bit arrives at the receiver until it is output in the aligned parallel word with RD0 received as first bit. The minimum latency in TBI mode is 22 bit times and the maximum latency is 31 bit times. The minimum latency in DDR mode is 28 bit times and maximum latency is 34 bit times. 10 Bit Code RXP, RXN RD(0−9) RBC0 10 Bit Code Td(Rx latency) Figure 6. Receiver Latency−TBI Normal Mode Shown loss of signal detection The TLK2201 has a loss of signal (LOS) detection circuit for conditions where the incoming signal no longer has sufficient voltage level to keep the clock recovery circuit in lock. The LOS is intended to be an indication of gross signal error conditions, such as a detached cable or no signal being transmitted, and not an indication of signal coding health. Under a PRBS serial input pattern, LOS is high for signal amplitudes greater than 150 mV. The LOS is low for all amplitudes below 50 mV. Between 50 mV and 150 mV, LOS is undetermined. |
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