Embedded Memory User Guide: Agilex™ 5 FPGAs and SoCs

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ID 813901
Date 4/01/2024
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Document Table of Contents
Document Table of Contents x
1. Agilex™ 5 Embedded Memory Overview 2. Agilex™ 5 Embedded Memory Architecture and Features 3. Agilex™ 5 Embedded Memory Design Considerations 4. Agilex™ 5 Embedded Memory IP References 5. Agilex™ 5 Embedded Memory Debugging 6. Document Revision History for the Embedded Memory User Guide: Agilex™ 5 FPGAs and SoCs
1. Agilex™ 5 Embedded Memory Overview x
1.1. Agilex™ 5 Embedded Memory Features
2. Agilex™ 5 Embedded Memory Architecture and Features x
2.1. Byte Enable in Agilex™ 5 Embedded Memory Blocks 2.2. Address Clock Enable Support 2.3. Asynchronous Clear and Synchronous Clear 2.4. Memory Blocks Error Correction Code (ECC) Support 2.5. Agilex™ 5 Embedded Memory Clocking Modes 2.6. Agilex™ 5 Embedded Memory Configurations 2.7. Force-to-Zero 2.8. Coherent Read Memory 2.9. Freeze Logic 2.10. True Dual Port Dual Clock Emulator 2.11. Initial Value of Read and Write Address Registers 2.12. Timing/Power Optimization Feature in M20K Blocks
2.1. Byte Enable in Agilex™ 5 Embedded Memory Blocks x
2.1.1. Byte Enable Controls 2.1.2. Data Byte Output 2.1.3. Byte Enable Behavior
2.4. Memory Blocks Error Correction Code (ECC) Support x
M20K Blocks 2.4.1. Parity Bit 2.4.2. ECC Parity Flip 2.4.3. ECC Read-During-Write Behavior 2.4.4. Error Correction Code Truth Table
2.5. Agilex™ 5 Embedded Memory Clocking Modes x
2.5.1. Single Clock Mode 2.5.2. Read/Write Clock Mode 2.5.3. Input/Output Clock Mode 2.5.4. Asynchronous/Synchronous Clears in Clocking Modes 2.5.5. Output Read Data in Simultaneous Read/Write 2.5.6. Independent Clock Enables in Clocking Modes
2.6. Agilex™ 5 Embedded Memory Configurations x
2.6.1. Mixed-Width Port Configurations
2.8. Coherent Read Memory x
2.8.1. Forwarding Logic
3. Agilex™ 5 Embedded Memory Design Considerations x
3.1. Consider the Memory Block Selection 3.2. Consider the Concurrent Read Behavior 3.3. Customize Read-During-Write Behavior 3.4. Consider Power-Up State and Memory Initialization 3.5. Reduce Power Consumption 3.6. Avoid Providing Non-Deterministic Input 3.7. Avoid Changing Clock Signals and Other Control Signals Simultaneously 3.8. Advanced Settings in Quartus® Prime Software for Memory 3.9. Consider the Memory Depth Setting 3.10. Consider Registering the Memory Output
3.3. Customize Read-During-Write Behavior x
3.3.1. Same-Port Read-During-Write Mode 3.3.2. Mixed-Port Read-During-Write Mode
4. Agilex™ 5 Embedded Memory IP References x
4.1. On Chip Memory RAM and ROM Intel® FPGA IP Cores 4.2. FIFO Intel® FPGA IP 4.3. Shift Register (RAM-based) Intel® FPGA IP
4.1. On Chip Memory RAM and ROM Intel® FPGA IP Cores x
4.1.1. Release Information for RAM and ROM Intel® FPGA IPs 4.1.2. RAM: 1-PORT Intel® FPGA IP Parameters 4.1.3. RAM: 2-PORT Intel® FPGA IP Parameters 4.1.4. RAM: 4-PORT Intel® FPGA IP Parameters 4.1.5. ROM: 1-PORT Intel® FPGA IP Parameters 4.1.6. ROM: 2-PORT Intel® FPGA IP Parameters 4.1.7. Changing Parameter Settings Manually 4.1.8. RAM and ROM Interface Signals
4.1.7. Changing Parameter Settings Manually x
4.1.7.1. RAM and ROM Parameter Settings
4.2. FIFO Intel® FPGA IP x
4.2.1. Release Information for FIFO Intel® FPGA IP 4.2.2. Configuration Methods 4.2.3. Specifications 4.2.4. FIFO Functional Timing Requirements 4.2.5. SCFIFO ALMOST_EMPTY Functional Timing 4.2.6. FIFO Output Status Flag and Latency 4.2.7. FIFO Metastability Protection and Related Options 4.2.8. FIFO Synchronous Clear and Asynchronous Clear Effect 4.2.9. SCFIFO and DCFIFO Show-Ahead Mode 4.2.10. Different Input and Output Width 4.2.11. DCFIFO Timing Constraint Setting 4.2.12. Coding Example for Manual Instantiation 4.2.13. Instantiation Template 4.2.14. Design Example 4.2.15. Gray-Code Counter Transfer at the Clock Domain Crossing 4.2.16. Guidelines for Embedded Memory ECC Feature 4.2.17. FIFO Intel® FPGA IP Parameters 4.2.18. Reset Scheme
4.2.3. Specifications x
4.2.3.1. Verilog HDL Prototype 4.2.3.2. VHDL Component Declaration 4.2.3.3. VHDL LIBRARY-USE Declaration 4.2.3.4. HDL Code from Parameterizable Macros Template 4.2.3.5. FIFO Signals 4.2.3.6. FIFO Parameter Settings
4.2.8. FIFO Synchronous Clear and Asynchronous Clear Effect x
4.2.8.1. Recovery and Removal Timing Violation Warnings when Compiling a DCFIFO
4.2.11. DCFIFO Timing Constraint Setting x
4.2.11.1. Embedded Timing Constraint 4.2.11.2. User Configurable Timing Constraint
4.2.11.2. User Configurable Timing Constraint x
4.2.11.2.1. SDC Commands
4.3. Shift Register (RAM-based) Intel® FPGA IP x
4.3.1. Release Information for Shift Register (RAM-based) Intel® FPGA IP 4.3.2. Shift Register (RAM-based) Intel® FPGA IP Features 4.3.3. Shift Register (RAM-based) Intel® FPGA IP General Description 4.3.4. Shift Register (RAM-based) Intel® FPGA IP Parameter Settings 4.3.5. Shift Register Ports and Parameters Setting
1. Agilex™ 5 Embedded Memory Overview
2. Agilex™ 5 Embedded Memory Architecture and Features
3. Agilex™ 5 Embedded Memory Design Considerations
4. Agilex™ 5 Embedded Memory IP References
5. Agilex™ 5 Embedded Memory Debugging
6. Document Revision History for the Embedded Memory User Guide: Agilex™ 5 FPGAs and SoCs

2.4. Memory Blocks Error Correction Code (ECC) Support

ECC detects and corrects data errors at the output of the memory.

The ECC feature is supported by M20K memory block only.

If you engage the ECC feature, you cannot use the following features:

  • Byte enable
  • Coherent read
  • Mixed data width

M20K Blocks

For M20K blocks, ECC performs single-error correction, double-adjacent-error correction, and triple-adjacent-error correction in a 32-bit word. However, ECC cannot guarantee detection or correction of non-adjacent two-bit or more errors.

The M20K blocks have built-in support for ECC when in ×32-wide simple dual-port mode.

  • When you engage the ECC feature, the M20K runs slower than the non-ECC simple dual-port mode. However, you can enable optional ECC pipeline registers before the output decoder to achieve higher performance compared to non-pipeline ECC mode at the expense of one-cycle latency.
  • Two ECC status flag signals—e (error) and ue (uncorrectable error) indicate the M20K ECC status. The status flags are part of the regular outputs from the memory block.

Section Content
Parity Bit
ECC Parity Flip
ECC Read-During-Write Behavior
Error Correction Code Truth Table

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