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[doc] add a figure about ecb

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tangxifan 2024-05-21 11:03:58 -07:00
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docs/source/manual/arch_lang/direct_interconnect.rst
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@ -78,7 +78,15 @@ In the OpenFPGA architecture file, you may define additional attributes for each
Enhanced Connection Block Enhanced Connection Block
~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~
The direct connection can also drive routing multiplexers of connection blocks. The direct connection can also drive routing multiplexers of connection blocks. When such connection occures in a connection block, it is called enhanced connection block.
:numref:`fig_ecb` illustrates the difference between a regular connection block and an enhanced connection block.
.. _fig_ecb:
.. figure:: ./figures/ecb.png
Enhanced connection block vs. Regular connection block
In such scenario, the type ``part_of_cb`` is required. In such scenario, the type ``part_of_cb`` is required.
.. warning:: Restrictions may be applied when building the direct connections as part of a connection block. .. warning:: Restrictions may be applied when building the direct connections as part of a connection block.

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