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AR# 47900

SelectIO Design Assistant: Interfacing to Xilinx devices

Description

This article forms part of the SelectIO Solution Centre (Xilinx Answer 50924).

It outlines the considerations when interfacing to other devices using SelectIO.

Solution

For interfacing any two devices, the basic rule is they should have the same or compatible I/O standard(s).

Xilinx devices are flexible enough to interface with most devices directly, due to their large array of IOSTANDARD settings.

Below is a basic checklist for I/O standards interfacing:

  • First of all, does the Xilinx Device support the required I/O standard natively?
    If so, examine both datasheets to ensure that they really line up electrically. 
  • Do the output logic levels comply with the input logic thresholds in both cases?
    If this is the case then you can proceed with a reasonable amount of confidence.
  • If the I/O standard is not supported by Xilinx, is there one available that closely matches? If so, then a close examination of the data sheet is required. 
  • Will there need to be level translation? Will you need to AC couple and bias the differential signal to a new common mode voltage?
    If this is the case then Xilinx strongly recommends an IBIS simulation of the proposed scheme to ensure that it is robust at the required data rate.

One common scenario we come across is MIPI-DPHY. 

There is no native support for this in 7 Series devices, so XAPP894 is available.

MIPI-DPHY is supported as an I/O standard in UltraScale+ devices.

For further information on IOSTANDARD settings and attributes see (Xilinx Answer 47278)


Below is a list of important articles relating to interfacing of Xilinx Devices:

(Xilinx Answer 11510)Can we leave differential inputs un-driven?
(Xilinx Answer 40191)Interfacing different types of LVDS in 7 Series
(Xilinx Answer 43428)Receiving sub-LVDS in Spartan-6
(Xilinx Answer 66786)Using LVDS in 1.2V UltraScale I/O banks.
(Xilinx Answer 63305)I/O support of LPDDR4

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
50926 Xilinx SelectIO Solution Center - Design Assistant N/A N/A

Child Answer Records

Associated Answer Records

Answer Number Answer Title Version Found Version Resolved
47278 SelectIO Design Assistant: Xilinx IOSTANDARD attributes and settings N/A N/A
47368 SelectIO Design Assistant: Xilinx I/O Standards N/A N/A
AR# 47900
Date 06/02/2017
Status Active
Type General Article
Devices
  • FPGA Device Families
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