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What is the folder called “ICM” that is generated when creating a PCI-Express core used for? What is the difference between the interface between the user application layer and the transaction layer, and the Avalon-ST interface?
The ICM (Incremental Compile Module) is used to replace this interface with the Avalon-ST interface when the PCIe core is configured with "Descriptor/Data".
See p.330 "Figure C-2 ICM Block Diagram" in the Altera document PCI Express Compiler User Guide at the URL link below.
https://www.altera.co.jp/ja_JP/pdfs/literature/ug/ug_pci_express.pdf
In this block diagram, the user application's interface is the Streaming interface. By inserting an ICM block in between, the interface with the PCIe transaction layer is converted to a Descriptor/Data interface. However, since ICM is used only for backward compatibility, Altera recommends that the PCIe core be configured with Avalon-ST for new designs.
For the meaning of each signal and the timing diagram, please refer to the linked document "C. Incremental Compile Module for Descriptor/Data Examples".
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