Agilex™ 7 Embedded Memory User Guide

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ID 683241
Date 7/24/2025
Public
Document Table of Contents
Document Table of Contents x
1. Agilex™ 7 Embedded Memory Overview 2. Agilex™ 7 Embedded Memory Architecture and Features 3. Agilex™ 7 Embedded Memory Design Considerations 4. Agilex™ 7 Embedded Memory IP References 5. Agilex™ 7 Embedded Memory Debugging 6. Agilex™ 7 Embedded Memory User Guide Archives 7. Document Revision History for the Agilex™ 7 Embedded Memory User Guide
1. Agilex™ 7 Embedded Memory Overview x
1.1. Agilex™ 7 Embedded Memory Features
2. Agilex™ 7 Embedded Memory Architecture and Features x
2.1. Fabric Network-On-Chip (NoC) in Agilex™ 7 M-Series M20K Blocks 2.2. Byte Enable in Agilex™ 7 Embedded Memory Blocks 2.3. Address Clock Enable Support 2.4. Asynchronous Clear and Synchronous Clear 2.5. Memory Blocks Error Correction Code (ECC) Support 2.6. Agilex™ 7 Embedded Memory Clocking Modes 2.7. Agilex™ 7 Embedded Memory Configurations 2.8. Force-to-Zero 2.9. Coherent Read Memory 2.10. Freeze Logic 2.11. True Dual Port Dual Clock Emulator 2.12. Initial Value of Read and Write Address Registers 2.13. Timing/Power Optimization Feature in M20K Blocks 2.14. Agilex™ 7 Supported Embedded Memory IPs
2.2. Byte Enable in Agilex™ 7 Embedded Memory Blocks x
2.2.1. Byte Enable Controls 2.2.2. Data Byte Output 2.2.3. Byte Enable Behavior
2.5. Memory Blocks Error Correction Code (ECC) Support x
2.5.1. Error Correction Code Truth Table 2.5.2. Parity Bit 2.5.3. ECC Parity Flip 2.5.4. ECC Read-During-Write Behavior
2.6. Agilex™ 7 Embedded Memory Clocking Modes x
2.6.1. Single Clock Mode 2.6.2. Read/Write Clock Mode 2.6.3. Input/Output Clock Mode 2.6.4. Asynchronous/Synchronous Clears in Clocking Modes 2.6.5. Output Read Data in Simultaneous Read/Write 2.6.6. Independent Clock Enables in Clocking Modes
2.7. Agilex™ 7 Embedded Memory Configurations x
2.7.1. Mixed-Width Port Configurations
2.9. Coherent Read Memory x
2.9.1. Forwarding Logic
2.11. True Dual Port Dual Clock Emulator x
2.11.1. True Dual-Port Mixed Port Read During Write New Data Emulation
3. Agilex™ 7 Embedded Memory Design Considerations x
3.1. Consider the Memory Block Selection 3.2. Consider the Concurrent Read Behavior 3.3. Read-During-Write (RDW) 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. M20K Embedded Memory Block Input Clock Quality Requirement 3.11. Consider Registering the Memory Output
3.3. Read-During-Write (RDW) x
3.3.1. Customize Read-During-Write Behavior
3.3.1. Customize Read-During-Write Behavior x
3.3.1.1. Same-Port Read-During-Write Mode 3.3.1.2. Mixed-Port Read-During-Write Mode
4. Agilex™ 7 Embedded Memory IP References x
4.1. On-Chip Memory RAM and ROM IPs 4.2. eSRAM Agilex™ FPGA IP 4.3. FIFO IP 4.4. Shift Register (RAM-based) FPGA IP
4.1. On-Chip Memory RAM and ROM IPs x
4.1.1. Release Information for RAM and ROM IPs 4.1.2. RAM: 1-PORT FPGA IP Parameters 4.1.3. RAM: 2-PORT FPGA IP Parameters 4.1.4. RAM: 4-PORT FPGA IP Parameters 4.1.5. ROM: 1-PORT FPGA IP Parameters 4.1.6. ROM: 2-PORT 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. eSRAM Agilex™ FPGA IP x
4.2.1. Release Information for eSRAM Agilex™ FPGA IP 4.2.2. eSRAM System Features 4.2.3. eSRAM Agilex™ FPGA IP Parameters 4.2.4. eSRAM Agilex™ FPGA IP Interface Signals 4.2.5. eSRAM Timing Diagrams
4.2.2. eSRAM System Features x
4.2.2.1. eSRAM Specifications
4.3. FIFO IP x
4.3.1. Release Information for FIFO IP 4.3.2. Configuration Methods 4.3.3. Specifications 4.3.4. FIFO Functional Timing Requirements 4.3.5. SCFIFO ALMOST_EMPTY Functional Timing 4.3.6. FIFO Output Status Flag and Latency 4.3.7. FIFO Metastability Protection and Related Options 4.3.8. FIFO Synchronous Clear and Asynchronous Clear Effect 4.3.9. SCFIFO and DCFIFO Show-Ahead Mode 4.3.10. Different Input and Output Width 4.3.11. DCFIFO Timing Constraint Setting 4.3.12. Coding Example for Manual Instantiation 4.3.13. Gray-Code Counter Transfer at the Clock Domain Crossing 4.3.14. Guidelines for Embedded Memory ECC Feature 4.3.15. FIFO IP Parameters 4.3.16. Reset Scheme
4.3.3. Specifications x
4.3.3.1. Verilog HDL Prototype 4.3.3.2. VHDL Component Declaration 4.3.3.3. VHDL LIBRARY-USE Declaration 4.3.3.4. HDL Code from Parameterizable Macros Template 4.3.3.5. FIFO Signals 4.3.3.6. FIFO Parameter Settings
4.3.8. FIFO Synchronous Clear and Asynchronous Clear Effect x
4.3.8.1. Recovery and Removal Timing Violation Warnings when Compiling a DCFIFO
4.3.11. DCFIFO Timing Constraint Setting x
4.3.11.1. Embedded Timing Constraint 4.3.11.2. User Configurable Timing Constraint
4.3.11.2. User Configurable Timing Constraint x
4.3.11.2.1. SDC Commands
4.4. Shift Register (RAM-based) FPGA IP x
4.4.1. Release Information for Shift Register (RAM-based) FPGA IP 4.4.2. Shift Register (RAM-based) FPGA IP 4.4.3. Shift Register (RAM-based) FPGA IP General Description 4.4.4. Shift Register (RAM-based) FPGA IP Parameter Settings 4.4.5. Shift Register Ports and Parameters Setting
1. Agilex™ 7 Embedded Memory Overview
2. Agilex™ 7 Embedded Memory Architecture and Features
3. Agilex™ 7 Embedded Memory Design Considerations
4. Agilex™ 7 Embedded Memory IP References
5. Agilex™ 7 Embedded Memory Debugging
6. Agilex™ 7 Embedded Memory User Guide Archives
7. Document Revision History for the Agilex™ 7 Embedded Memory User Guide

4.3.9. SCFIFO and DCFIFO Show-Ahead Mode

You can set the read request (rdreq) signal read access behavior by selecting normal or show-ahead mode.

For normal mode, the FIFO IP treats the rdreq port as a normal read request that only performs read operation when the port is asserted.

For show-ahead mode, the FIFO IP treats the rdreq port as a read-acknowledge that automatically outputs the first word of valid data in the FIFO IP (when the empty is low) without asserting the rdreq signal. Asserting the rdreq signal causes the FIFO IP to output the next data word, if available.

Figure 39. Normal Mode Waveform

Data appears after the rdreq asserted.
Figure 40. Show-Ahead Mode Waveform

Data appears before the rdreq asserted.
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