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[Doc] Update documentation about the fast configuration for write bitstream command

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tangxifan 2021-06-04 20:00:28 -06:00
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docs/source/manual/openfpga_shell/openfpga_commands/fpga_bitstream_commands.rst
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@ -69,6 +69,15 @@ write_fabric_bitstream
Specify the file format [``plain_text`` | ``xml``]. By default is ``plain_text``.
See file formats in :ref:`file_formats_fabric_bitstream_xml` and :ref:`file_formats_fabric_bitstream_plain_text`.
.. option:: --fast_configuration
Reduce the bitstream size when outputing by skipping dummy configuration bits. It is applicable to configuration chain, memory bank and frame-based configuration protocols. For configuration chain, when enabled, the zeros at the head of the bitstream will be skipped. For memory bank and frame-based, when enabled, all the zero configuration bits will be skipped. So ensure that your memory cells can be correctly reset to zero with a reset signal.
.. warning:: Fast configuration is only applicable to plain text file format!
.. note:: If both reset and set ports are defined in the circuit modeling for programming, OpenFPGA will pick the one that will bring largest benefit in speeding up configuration.
.. option:: --verbose
Show verbose log