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TLK3101 Datasheet(PDF) 11 Page - Texas Instruments |
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TLK3101 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 24 page TLK3101 2.5 Gbps to 3.125 Gbps TRANSCEIVER SCAS649A – AUGUST 2000 – REVISED FEBRUARY 2001 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 redundant port operation The TLK3101 allows users to design redundant ports by connecting receive data bus pins from two TLK3101 devices together. Asserting LCKREFN to a low state will cause the receive data bus pins, RXD[0:15], RX_CLK and RX_ER, RX_DV/LOS to go to a high-impedance state. PRBS verification The TLK3101 also has a built-in BERT function in the receiver side that is enabled by PRBSEN. It checks for errors and reports the errors by forcing the RX_ER/PRBSPASS pin low. reference clock input The reference clock (GTX_CLK) is an external input clock that synchronizes the transmitter interface. The reference clock is then multiplied in frequency 10 times to produce the internal serialization bit clock. The internal serialization bit clock is frequency-locked to the reference clock and used to clock out the serial transmit data on both its rising and falling edges, providing a serial data rate that is 20 times the reference clock. operating frequency range The TLK3101 is optimized for operation at a serial data rate of 3.125 Gbit/s. The TLK3101 may operate at a serial data rate between 2.5 Gbit/s to 3.125 Gbit/s. GTX_CLK must be within ±100 PPM of the desired parallel data rate clock. testability The TLK3101 has a comprehensive suite of built-in self-tests. The loopback function provides for at-speed testing of the transmit/receive portions of the circuitry. The ENABLE pin allows for all circuitry to be disabled so that a quiescent current test can be performed. The PRBS function allows for BIST (built-in self-test). loop-back testing The transceiver can provide a self-test function by enabling (LOOPEN) the internal loopback path. Enabling this pin will cause serial transmitted data to be routed internally to the receiver. The parallel data output can be compared to the parallel input data for functional verification. The external differential output is held in a high-impedance state during the loopback testing. built-in self-test The TLK3101 has a BIST (built-in self-test) function. By combining PRBS with loopback, an effective self-test of all the circuitry running at full speed can be realized. The successful completion of the BIST is reported on the RX_ER/PRBS_PASS pin. power-on reset Upon application of minimum valid power, the TLK3101 generates a power-on reset. During the power-on reset the RXD, RX_ER and RX_DV/LOS signal pins go to 3-state mode. RX_CLK is held low. The length of the power-on reset cycle is dependent upon the REFCLK frequency but is less than 1-ms in duration. |
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