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AR# 51448

7 Series FPGA GTP Transceivers - RX Termination Use Modes

This answer record describes the 7 series GTP Transceiver RX termination use modes for different protocols and usage scenarios.

The RX termination use modes are covered in this table. This is added to or updated in the 7 Series FPGAs GTP Transceivers User Guide (UG482) v1.4.

Use Mode	External AC Coupling	Term Voltage	Max Swing mV_DPP	Suggested Protocols and Usage Notes
1	On	Gnd	1200	Protocol: GND Terminated interfaces Attribute Settings: RX_CM_SEL[1:0] = 2'b01 RXLPM_INCM_CFG = 1'b0 RXLPM_IPCM_CFG = 1'b1
2	On	AVTT	1200	Protocol: CEI-6 (1200 mVDPP) Wireless Serial RapidIO Attribute Settings: RX_CM_SEL[1:0] = 2b00 RXLPM_INCM_CFG = 1'b1 RXLPM_IPCM_CFG = 1'b0
3	On	800 mV	2000	Protocols: Optical IF (SONET/SDH/OTU), XAUI (1600 mVdpp),GbE, PCIe CEI-6 (1200 mVDPP) Wireless Serial RapidIO Attribute Settings: RX_CM_SEL [1:0] = 2b11 RX_CM_TRIM[3:0] = 4b1010 RXLPM_INCM_CFG = 1'b1 RXLPM_IPCM_CFG = 1'b0
4	Off	Float	2000	Protocol: GPON Attribute Settings: RX_CM_SEL[1:0] = 2b10 Depends on circuit implementation. Likely High Common Mode RXLPM_INCM_CFG = 1'b1 RXLPM_IPCM_CFG = 1'b0

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Answer Number	Answer Title	Version Found	Version Resolved
47852	7 Series FPGAs GTP Transceivers - Known Issues and Answer Record List	N/A	N/A