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AR# 51448

7 Series FPGA GTP Transceivers - RX Termination Use Modes

Description

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

Solution

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 mVDPP 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

 

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
47852 7 Series FPGAs GTP Transceivers - Known Issues and Answer Record List N/A N/A
AR# 51448
Date Created 08/23/2012
Last Updated 10/04/2013
Status Active
Type General Article
Devices
  • Artix-7