FIFO Intel® FPGA IP User Guide

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ID 683522
Date 3/29/2024
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Document Table of Contents
Document Table of Contents x
1. FIFO Intel® FPGA IP User Guide
1. FIFO Intel® FPGA IP User Guide x
1.1. Configuration Methods 1.2. Specifications 1.3. FIFO Functional Timing Requirements 1.4. SCFIFO ALMOST_EMPTY Functional Timing 1.5. FIFO Output Status Flag and Latency 1.6. FIFO Metastability Protection and Related Options 1.7. FIFO Synchronous Clear and Asynchronous Clear Effect 1.8. SCFIFO and DCFIFO Show-Ahead Mode 1.9. Different Input and Output Width 1.10. DCFIFO Timing Constraint Setting 1.11. Coding Example for Manual Instantiation 1.12. Design Example 1.13. Gray-Code Counter Transfer at the Clock Domain Crossing 1.14. Guidelines for Embedded Memory ECC Feature 1.15. FIFO Intel® FPGA IP User Guide Archives 1.16. Document Revision History for the FIFO Intel® FPGA IP User Guide
1.2. Specifications x
1.2.1. Verilog HDL Prototype 1.2.2. VHDL Component Declaration 1.2.3. VHDL LIBRARY-USE Declaration 1.2.4. FIFO Signals 1.2.5. FIFO Parameter Settings
1.7. FIFO Synchronous Clear and Asynchronous Clear Effect x
1.7.1. Recovery and Removal Timing Violation Warnings when Compiling a DCFIFO
1.10. DCFIFO Timing Constraint Setting x
1.10.1. Embedded Timing Constraint 1.10.2. User Configurable Timing Constraint
1.10.2. User Configurable Timing Constraint x
1.10.2.1. SDC Commands
1. FIFO Intel® FPGA IP User Guide

1.14. Guidelines for Embedded Memory ECC Feature

The FIFO Intel® FPGA IP cores support embedded memory ECC for M20K memory blocks. The built-in ECC feature in the devices can perform:

  • Single-error detection and correction
  • Double-adjacent-error detection and correction
  • Triple-adjacent-error detection

You can turn on FIFO Embedded ECC feature by enabling enable_ecc parameter in the FIFO Intel® FPGA IP GUI.

Note: Embedded memory ECC feature is only available for M20K memory block type.
Note: The embedded memory ECC supports variable data width. When ECC is enabled, RAM combines multiple M20K blocks in the configuration of 32 (width) x 512 (depth) to fulfill your instantiation. The unused data width is tied to the VCC internally.
Note: The embedded memory ECC feature is not supported in mixed-width mode.
Figure 15. ECC Option in FIFO Intel® FPGA IP GUI

When you enable the ECC feature, a 2-bit wide error correction status port (eccstatus[1:0]) is created in the generated FIFO entity. These status bits indicate whether the data that is read from the memory has an error in single-bit with correction, fatal error with no correction, or no error bit.

  • 00: No error
  • 01: Illegal
  • 10: A correctable error occurred and the error has been corrected at the outputs; however, the memory array has not been updated.
  • 11: An uncorrectable error occurred and uncorrectable data appears at the output
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