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[Doc] Update documentation about configuration regions for frame-based protocol

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tangxifan 2020-10-30 21:52:01 -06:00
parent 940eb937f2
commit 7e940980e1
1 changed files with 9 additions and 3 deletions
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docs/source/manual/arch_lang/config_protocol.rst
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@ -41,6 +41,13 @@ Template
- ``memory_bank`` requires a circuit model type of ``sram``
- ``standalone`` requires a circuit model type of ``sram``
.. option:: num_regions="<int>"
Specify the number of configuration regions to be used across the fabrics. By default, it will be only 1 configuration region. Each configuration region contains independent configuration protocols, but the whole fabric should employ the same type of configuration protocols. For example, an FPGA fabric consists of 4 configuration regions, each of which includes a configuration chain. The more configuration chain to be used, the fast configuration runtime will be, but at the cost of more I/Os in the FPGA fabrics. The organization of each configurable region can be customized through the fabric key (see details in :ref:`fabric_key`).
.. warning:: Currently, multiple configuration regions is not applicable to ``standalone`` configuration protocol.
Configuration Chain Example
~~~~~~~~~~~~~~~~~~~~~~~~~~~
The following XML code describes a scan-chain circuitry to configure the core logic of FPGA, as illustrated in :numref:`fig_ccff_fpga`.
@ -60,9 +67,6 @@ It will use the circuit model defined in :numref:`fig_ccff`.
Example of a configuration chain to program core logic of a FPGA
.. option:: num_regions="<int>"
Specify the number of configuration chains to be used across the fabrics. By default, it will be only 1 configuration chain. The more configuration chain to be used, the fast configuration runtime will be, but at the cost of more I/Os in the FPGA fabrics. The organization of each configurable region can be customized through the fabric key (see details in :ref:`fabric_key`).
.. figure:: figures/multi_region_config_chains.png
:scale: 100%
@ -113,6 +117,8 @@ When the decoder of sub block, e.g., the LUT, is enabled, each memory cells can
.. warning:: Please do NOT add inverted Bit-Line and Word-Line inputs. It is not supported yet!
When multiple configuration region is applied, the configuration frames will be grouped into different configuration regions. Each region has a separated data input bus and dedicated address decoders. As such, the configuration frame groups can be programmed in parallel.
Memory bank Example
~~~~~~~~~~~~~~~~~~~
The following XML code describes a memory-bank circuitry to configure the core logic of FPGA, as illustrated in :numref:`fig_memory_bank`.