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A common question in the #nMigen Libera.Chat channel asks how one can include a non-nMigen component—e.g. a library cell or a component from a Verilog design—so it seemed worth writing up a quick note we can link to answer that. 
 Invoking a Component 
 The key is to create an nmigen.Instance component, as in the following example: 
 m . submodules . my_component =…

A common question in the #nMigen Libera.Chat channel asks how one can include a non-nMigen component—e.g. a library cell or a component from a Verilog design—so it seemed worth writing up a quick note we can link to answer that.

Invoking a Component

The key is to create an nmigen.Instance component, as in the following example:

m.submodules.my_component = Instance("CustomFlipFlop",
		# Attributes
		a_HasAsyncReset = False,
		
		# Parameters
		p_NumberInputs  = "1",
		p_NumberOutputs = "1",

		# Inputs
		i_D = my_input_signal,
		
		# Ouptuts
		o_Q = my_output_signal,
		
		# Bidirectional / inouts
		io_DZ = my_tristate_pin
)

The first parameter to the Instance constructor is the name of the component to be instantiated, which usually matches e.g. your library cell instance, or your Verilog module name. The remaining (keyword) arguments are the inputs and outputs to the Instance. As these inputs/outputs to this function currently lack type information, we’ll need to prefix each name with a short prefix, depending on its type:

Including non-nMigen Instances in nMigen

Invoking a Component

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