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  3. AR# 47145: 7 Series DCI - What are the supported values of the external reference resistors VRN and VRP?

AR# 47145

7 Series DCI - What are the supported values of the external reference resistors VRN and VRP?

Description

There are three types of DCI:
 
  • Controlled Impedance Driver (Source Termination)
  • Controlled Impedance Driver with Half Impedance (Source Termination)
  • Split-Termination DCI (Thevenin Equivalent Termination to VCCO/2)

how should I select the value of the external reference resistors?

Solution

For the spilt termination and the DIV2 Controlled Impedance driver DCI the supported values for the VRN/VRP resistors are 80, 100 or 120 Ohms.

For the Non-DIV2 Controlled Impedance Driver DCI, the VRN/VRP resistors should be 40, 50 or 60 ohm.

The tolerance for the resistors are 1%.



AR# 47145
Date 10/13/2014
Status Active
Type General Article
Devices
  • Virtex-7
  • Virtex-7 HT
  • Kintex-7
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