Xilinx 7 Series User Manual

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Xilinx 7 Series User Manual Manual pdf 139 page image

7 Series FPGAs GTP Transceivers User Guide www.xilinx.com 139UG482 (v1.9) December 19, 2016RX EqualizerRX EqualizerFunctional DescriptionThe GTP transceiver receiver has a power-efficient adaptive continuous time linear equalizer(CTLE) to compensate for signal distortion due to high-frequency attenuation in the physicalchannel. To maintain parity with the 7 series FPGAs GTX and GTH transceivers, the CTLE isreferred to as the low-power mode (LPM).The LPM mode (see Figure 4-15) has adaptive low and high frequency boosts. It is for applicationswith line rates up to 6.6 Gb/s for short reach applications, with channel losses of 12 dB or less at theNyquist frequency.Ports and AttributesTable 4-9 defines the RX equalizer ports.Table 4-10 defines the RX equalizer attributes.X-Ref Target - Figure 4-15Figure 4-15: RX Equalization Block DiagramTerminationPN CTLEUG482_c4_05_110911CDRTable 4-9: RX Equalizer PortsPort Dir Clock Domain DescriptionRXLPMRESET In Async Resets the LPM circuitry.RXLPMHFHOLD In Async When set to 1'b1, the current value of thehigh-frequency boost is held.When set to 1'b0, the high-frequency boost isadapted.RXLPMHFOVRDEN In Async When set to 1'b1, the high-frequency boost iscontrolled by the RXLPM_HF_CFG attribute.When set to 1'b0, the high-frequency boost iscontrolled by the RXLPMHFHOLD signal.RXLPMLFHOLD In Async When set to 1'b1, the current value of thelow-frequency boost is held.When set to 1'b0, the low-frequency boost isadapted.RXLPMLFOVRDEN In Async When set to 1'b1, the low-frequency boost iscontrolled by the RXLPM_LF_CFG attribute.When set to 1'b0, the low-frequency boost iscontrolled by the RXLPMLFHOLD signal.Send Feedback