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Solve the problem of automatic IDELAYCTRL placement #1481

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mkurc-ant opened this issue May 12, 2020 · 1 comment
Open

Solve the problem of automatic IDELAYCTRL placement #1481

mkurc-ant opened this issue May 12, 2020 · 1 comment

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@mkurc-ant
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Some designs that use IDELAYs from only one clock region instantiate an IDELAYCTRL without explicitly specifying its placement location. The toolchain places it automatically in the correct clock region. Currently in SymbiFlow there is no such a mechanism. It is required to use eg. LiteX generated DDR memory interface without the need of manually placing the IDELAYCTRL
@litghost
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The clock placer script could be generalize to support this. Also not that there is a property "delay_groups" I believe that is intended to hint at this.

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@litghost @mkurc-ant