s-harada
New Contributor
1 day agoQuartus Error When No Read Path Exists on F2H Bridge
Hello,
I am currently investigating a Quartus compilation error related to the FPGA-to-HPS (F2H) bridge on Agilex 5 devices.
[Environment]
- Device: Agilex 5
- Tool: Quartus Prime Pro v25.3
[Issue / Observed Behavior]
- Connection configuration:
mSGDMA (Streaming to MM) -> CCT -> F2H bridge (see attached diagram)
- HDL generation in Platform Designer completes successfully
- In the RTL Viewer, the F2H-related logic appears to be instantiated, and the F2SOC_RDATA signal seems to be present in the generated RTL
- However, during Quartus Prime compilation (Synthesis phase), the following errors occur:
[Workarounds / Configuration Changes Tested]
To ensure that a Read path toward the F2H bridge exists, we tested the following changes:
- Connecting the F2H bridge via a JTAG Avalon Master Bridge
- Changing the mSGDMA DMA mode from "Streaming to MM" to "MM to MM", and connecting mm_read to the CCT
- Enabling mSGDMA Pre-Fetching Options, and connecting descriptor_read_master / descriptor_write_master to the CCT
These changes allow a read-capable master to exist toward the F2H bridge.
[Question / Confirmation Point]
- In a configuration where no read-capable master exists toward the F2H bridge, is it expected (by specification) that Quartus determines the F2H interface as not connected, even if the corresponding signals (e.g. F2SOC_RDATA) appear to exist in the RTL?
- Even if the design logically requires write-only accesses, is a valid read path master still mandatory for the fpga2hps interface to be considered legally connected?
Thank you in advance for any clarification.