Add MulDivIterativePlugin in readme
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README.md
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README.md
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+ [DBusCachedPlugin](#dbuscachedplugin)
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+ [MulPlugin](#mulplugin)
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+ [DivPlugin](#divplugin)
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+ [MulDivIterativePlugin](#MulDivIterativePlugin)
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+ [CsrPlugin](#csrplugin)
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+ [StaticMemoryTranslatorPlugin](#staticmemorytranslatorplugin)
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+ [MemoryTranslatorPlugin](#memorytranslatorplugin)
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@ -893,7 +894,27 @@ Implement the multiplication instruction from the RISC-V M extension. Its implem
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#### DivPlugin
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Implement the division/modulo instruction from the RISC-V M extension. It is done by a simple iterative manner which always take 34 cycles. The result is inserted into the Memory stage.
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Implement the division/modulo instruction from the RISC-V M extension. It is done by a simple iterative manner which always take 34 cycles. The result is inserted into the Memory stage.
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This plugin is now based on the MulDivIterativePlugin one.
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#### MulDivIterativePlugin
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This plugin implement the multiplication, division and modulo of the RISC-V M extension by an iterative manner, which is friendly for small FPGA which don't provide DSP blocks.
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This plugin is able to unrool the iterative calculation process to reduce the number of cycles used to execute mul/div instructions.
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| Parameters | type | description |
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| ------ | ----------- | ------ |
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| genMul | Boolean | Enable the multiplication support, can be set to false if you wan for instance to use the MulPlugin instead |
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| genDiv | Boolean | Enable the division support |
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| mulUnroolFactor | Int | Number of combinatorial stages used to speed up the multiplication, should be > 0 |
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| divUnroolFactor | Int | Number of combinatorial stages used to speed up the division, should be > 0 |
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The number of cycles used to execute a multiplication is '32/mulUnroolFactor'
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The number of cycles used to execute a division is '32/divUnroolFactor + 1'
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Both mul/div are processed into the memory stage (late result)
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#### CsrPlugin
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