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AR# 44103

13.3 Bitgen - 7 Series - DriveDONE option is no longer available as a bitstream generation option

Description

For 7 Series devices, the DriveDONE option will no longer be available as a bitstream generation option from ISE 13.3 design tools. It will be removed from the documentation and software. Does this mean that my device will not configure if I do not use an external pullup resistor?

Solution

Configuration should complete even in the case where you do not have an external pullup resistor for DONE. Changes have been made to the DONE structure for 7 series devices.

  1. Addition of a stronger internal pullup
  2. Removal of the setup/hold need/requirement for DONE


An additional software change has also been made. The "DonePipe" option is now turned on by default. This will allow for the insertion of a second register to the DONE signal prior to being read by any logic. The DonePipe change is documented in (Xilinx Answer 44237). If the "DonePipe" option is disabled, then an external pullup needs to be added.

These changes make the DONE transition more robust and not as prone to issues with slow rise time as in previous families. The DONE pin can still be used to drive an LED using an appropriate external resistor value.

Linked Answer Records

Associated Answer Records

Answer Number Answer Title Version Found Version Resolved
44237 13.3 - Bitgen - 7 Series - DonePipe option is now enabled by default N/A N/A
AR# 44103
Date Created 11/08/2011
Last Updated 05/03/2013
Status Active
Type General Article
Devices
  • Kintex-7
  • Artix-7
  • Virtex-7
  • Virtex-7 HT