![]() ![]() Instance.Input, Instance.Output or Instance.InOut to describe signal connections with the instance.name of the instantiated module) of the instance, then multiple parameters describing how to connect and parametrize the instance. The instance object constructor takes the type (i.e. Breaking down a Migen system into multiple sub-systems.Implementing logic that cannot be expressed with FHDL (e.g.Using special FPGA features (DCM, ICAP, …).Reusing legacy or third-party V*HDL code.Instance objects represent the parametrized instantiation of a V*HDL module, and the connection of its ports to FHDL signals. For example, the following statements will create one or several signals named “bar”: If no name property is specified, Migen will analyze the code that created the signal object, and try to extract the variable or member name from there. The back-end will generate a unique name for each object. From a purely functional point of view, it is perfectly OK to have several signals with the same name property. The sole purpose of the name property is to make the generated V*HDL code easier to understand and debug. If the signal is permanently driven using a combinatorial statement, the reset value has no effect. This enforces the absence of latches in designs. When the signal is assigned to in a conditional combinatorial statement ( If or Case), the reset value is the value that the signal has when no condition that causes the signal to be driven is verified. When the signal’s value is modified with a synchronous statement, the reset value is the initialization value of the associated register. It must be an integer, and defaults to 0. ![]()
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