Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs

ID 814346
Date 7/19/2024
Public

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11.6.1. FPGA-to-HPS Bridge Clocks and Resets

The initiator interface of the bridge in the HPS logic operates in the mpu_ccu_clk clock domain. The responder interface exposed to the FPGA fabric operates in the fpga2hps_clock clock domain provided by the user logic. The bridge provides clock crossing logic that allows the logic in the FPGA to operate in any clock domain, asynchronous from the HPS. The F2H bridge has one reset signal, fpga2hps_reset. The reset manager asserts this signal to the F2H bridge on a cold or warm reset. The bridge expects the FPGA to be in user mode (with valid logic connected to the bridge) before bridge reset is deasserted.