128 www.xilinx.com 7 Series FPGAs GTP Transceivers User Guide
UG482 (v1.9) December 19, 2016
Chapter 4: Receiver
Use Modes—RX Termination
TERM_RCAL_OVRD 3-bit Binary Selects whether the external 100Ω precision resistor
connected to the MGTRREF pin or an override
value is used, as defined by TERM_RCAL_CFG
[14:0]. This feature is intended for internal use only.
RXLPM_INCM_CFG 1-bit Binary 1'b1 = Enable high common mode operation
1'b0 = Disable high common mode operation
RXLPM_IPCM_CFG 1-bit Binary 1'b1 = Enable low common mode operation
1'b0 = Disable low common mode operation
Table 4-2: RX AFE Attributes (Cont’d)
Attribute Type Description
Table 4-3: Use Mode 1—RX Termination
Use
Mode
External AC
Coupling
Term
Voltage
Max Swing
mV
DPP
Suggested Protocols and
Usage Notes
1 On Gnd 1,200
Attribute Settings:
• RX_CM_SEL[1:0] = 2'b01
• RXLPM_INCM_CFG = 1'b0
• RXLPM_IPCM_CFG = 1'b1
X-Ref Target - Figure 4-3
Figure 4-3: Use Mode 1
~100 nF
50Ω
50Ω
~100 nF
FPGABOARD
ACJTAG RX
ACJTAG RX
MGTAVTT
MGTAVTT
GND
RX_CM_SEL [1:0] = 2'b01
UG482_c4_03_020613
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