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50.5.1.1. Data Path
For transmit path, the GMII data goes through the transmit pipeline register stage before going into the altera_gpio block. The pipeline logic is optional and you can enabled or disabled during IP generation time.
For receive path, the GMII data right after the altera_gpio block goes through the receive pipeline register stage then directly to the HPS EMAC GMII interface. Similarly, you can enable or disable this pipeline logic during IP generation time.
The altera_gpio block (configured in DDIO mode) manages single data rate to double data rate conversion and vice-versa. The Agilex™ 5 FPGA HVIO component is used to perform this task. This block also decodes collision and carrier sense condition through In-Band status detection.