Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs

ID 814346
Date 11/27/2024
Public
Document Table of Contents

11.5.4. FPGA-to-SDRAM Bridge

F2SDRAM bridge allows logic in the fabric to perform non-coherent access to SDRAM. The access supports 256/128/64-bit AXI-4 interface.

The following figure shows the F2SDRAM block diagram.

Figure 292. F2SDRAM Bridge Block Diagram

The following table lists the signals for the F2SDRAM bridge.

Table 351.  F2SDRAM Signals
Name Direction Description
f2sdram_axi_clock Input

Clock from a single source in FPGA

f2sdram_axi_reset Input

Async active high reset to the bridge

F2SDRAM_port_size_config[2:0] Input

[2]: reserved

[1:0]: Port width selection:

  • 00: AXI-4 64-bit
  • 01: AXI-4 128-bit
  • 10: AXI-4 256-bit
  • 11: Reserved
Note: h2f_reset signal must be connected to f2sdram_axi_reset signal for proper bridge operation.

The following table shows the properties of the F2SDRAM bridge.

Table 352.  F2SDRAM Bridge Properties
Bridge Property Value
Protocol AXI
Clock f2sdram_axi_clock (from Fabric)
Data Width 64/128/256
Address Width 40
ID Width 5
A*Region Width 0
A*Len Width 9/8/7 ( 64/128/256 )
A*QoS Width 4
FIXED Burst No
Exclusive Support Yes
Min Narrow Burst Size 1 byte
Max Wrap Burst length 16
nPendingTrans (Issuance/Acceptance) 16
nPendingOrderID 16
Read Interleaving Yes Yes
Ready Latency requirement Yes Yes