Generic Serial Flash Interface Intel® FPGA IP User Guide

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ID 683419
Date 4/24/2025
Public
Document Table of Contents
Document Table of Contents x
1. Generic Serial Flash Interface Intel® FPGA IP User Guide
1. Generic Serial Flash Interface Intel® FPGA IP User Guide x
1.1. Release Information 1.2. Device Family Support 1.3. Signals 1.4. Parameters 1.5. Register Map 1.6. Using Generic Serial Flash Interface Intel® FPGA IP 1.7. Generic Serial Flash Interface Intel® FPGA IP Reference Design 1.8. Flash Access Using the Generic Serial Flash Interface Intel® FPGA IP 1.9. Intel HAL Driver 1.10. Generic Serial Flash Interface Intel® FPGA IP User Guide Archives 1.11. Document Revision History for the Generic Serial Flash Interface Intel® FPGA IP User Guide
1.6. Using Generic Serial Flash Interface Intel® FPGA IP x
1.6.1. Control Status Register Byte Enable 1.6.2. Memory Operations 1.6.3. Byte Enabling 1.6.4. Constraining the I/O Pins
1.6.3. Byte Enabling x
1.6.3.1. Byte Enabling Supported Patterns
1.6.4. Constraining the I/O Pins x
1.6.4.1. General Purpose I/O 1.6.4.2. Dedicated Active Serial Interface
1.7. Generic Serial Flash Interface Intel® FPGA IP Reference Design x
1.7.1. Hardware and Software Requirements 1.7.2. Functional Description 1.7.3. Creating Nios® II Hardware System 1.7.4. Integrating Modules into Quartus® Prime Project 1.7.5. Programming the .sof File 1.7.6. Building Application Software System using Nios® II Software Build Tools
1.7.2. Functional Description x
1.7.2.1. Reference Design Components 1.7.2.2. Reference Design Application Program
1.7.6. Building Application Software System using Nios® II Software Build Tools x
1.7.6.1. Reference Design Results
1.8. Flash Access Using the Generic Serial Flash Interface Intel® FPGA IP x
1.8.1. Flash Operations that Require Operation Code 1.8.2. Flash Operations to Read Flash Registers 1.8.3. Flash Operations to Write Flash Registers 1.8.4. Flash Operations that Require An Address 1.8.5. Read Memory from the Flash 1.8.6. Program Flash
1.9. Intel HAL Driver x
1.9.1. Driver API
1. Generic Serial Flash Interface Intel® FPGA IP User Guide

1.6.2. Memory Operations

During flash memory access, the IP performs the following steps to allow you to perform any direct read or write operation:

  • Write enable for write operation
  • Check flag status register to make sure the operation has been completed at the flash
  • Release waitrequest signal when operation completed

Memory operations are Avalon® memory-mapped operations. You must set the correct address on the address bus, write data if it is write transaction, drive burst count bus 1 if single transaction or desired burst count value and trigger the write or read signal.

Note: For multiple flash device setup, the address bus is extended to include the chip select value.
Figure 2. 8-Word Write Burst Waveform Example
Figure 3. 8-Word Reading Burst Waveform Example
Figure 4. 1-Byte Write byteenable = 4’b0001 Waveform Example
Note:

There are two internal unconstrained clocks in the Generic Flash Serial Interface Intel® FPGA IP core when you compile your design in the Quartus® Prime Pro Edition software. Intel® recommends that you constraint the path by using the following command: 

create_generated_clock -name <name_of_generated_clock> -source [get_ports <input_clock_name>] -divide_by 2 [get_registers <path_of_the_unconstrained_path>]
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