7 Series FPGAs GTP Transceivers User Guide www.xilinx.com 139
UG482 (v1.9) December 19, 2016
RX Equalizer
RX Equalizer
Functional Description
The 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 physical
channel. To maintain parity with the 7 series FPGAs GTX and GTH transceivers, the CTLE is
referred to as the low-power mode (LPM).
The LPM mode (see Figure 4-15) has adaptive low and high frequency boosts. It is for applications
with line rates up to 6.6 Gb/s for short reach applications, with channel losses of 12 dB or less at the
Nyquist frequency.
Ports and Attributes
Table 4-9 defines the RX equalizer ports.
Table 4-10 defines the RX equalizer attributes.
X-Ref Target - Figure 4-15
Figure 4-15: RX Equalization Block Diagram
Termination
P
N
CTLE
UG482_c4_05_110911
CDR
Table 4-9: RX Equalizer Ports
Port Dir Clock Domain Description
RXLPMRESET In Async Resets the LPM circuitry.
RXLPMHFHOLD In Async When set to 1'b1, the current value of the
high-frequency boost is held.
When set to 1'b0, the high-frequency boost is
adapted.
RXLPMHFOVRDEN In Async When set to 1'b1, the high-frequency boost is
controlled by the RXLPM_HF_CFG attribute.
When set to 1'b0, the high-frequency boost is
controlled by the RXLPMHFHOLD signal.
RXLPMLFHOLD In Async When set to 1'b1, the current value of the
low-frequency boost is held.
When set to 1'b0, the low-frequency boost is
adapted.
RXLPMLFOVRDEN In Async When set to 1'b1, the low-frequency boost is
controlled by the RXLPM_LF_CFG attribute.
When set to 1'b0, the low-frequency boost is
controlled by the RXLPMLFHOLD signal.
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