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  • 4 commits
  • 6 files changed
  • 2 contributors

Commits on Apr 2, 2016

  1. migen/build/platforms: adding apf6sp Armadeus Platform 

    Signed-off-by: Fabien Marteau <fabien.marteau@armadeus.com>
    @Martoni @sbourdeauducq
    Martoni authored and sbourdeauducq committed Apr 2, 2016
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    7cb3634 View commit details

  2. migen/genlib: little module documentation 

    Signed-off-by: Fabien Marteau <fabien.marteau@armadeus.com>
    @Martoni @sbourdeauducq
    Martoni authored and sbourdeauducq committed Apr 2, 2016
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    dc724f9 View commit details

  3. migen/fhdl: better error messages 

    Signed-off-by: Fabien Marteau <fabien.marteau@armadeus.com>
    @Martoni @sbourdeauducq
    Martoni authored and sbourdeauducq committed Apr 2, 2016
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    1acfa57 View commit details

  4. build/xilinx/ise: Use separate TNM_NET for period and TIG constraints. 

    Because ISE is retarded, if you have anything other than period constraints on
a TNM_NET (such as a TIG), then it is unable to trace the constraints through
any of the clock elements like PLLs and DCMs. It will generate the following
warning instead;

> ConstraintSystem - TNM : *** was distributed to a DCM but new TNM constraints
> were not derived. The requirement for derived TNM constraints is that the
> distributed TNM is referenced by no more than a single PERIOD constraint.
> Non-PERIOD referencers are also not allowed.

The requirements for the TNM to be derived is described at
[Timing Constraints User Guide - UG612 (v 11.1.1) April 29, 2009](http://www.xilinx.com/support/documentation/sw_manuals/xilinx11/ug612.pdf):

 * The TNM group is used in exactly one PERIOD specification.
 * The TNM group is not used in any FROM-TO or OFFSET specifications.
 * The TNM group is not referenced in any user group definition.

The fix is described in http://www.xilinx.com/support/answers/40007.html ||
http://www.xilinx.com/support/answers/37782.html

Create two TNM Groups for your input clock. One used for the FROM-TO
constraints and the other for the PERIOD propagation.

Fixes #43
    @mithro @sbourdeauducq
    mithro authored and sbourdeauducq committed Apr 2, 2016
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