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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. Embedded Memory User Guide: Agilex™ 5 FPGAs and SoCs Archives
7. Document Revision History for the Embedded Memory User Guide: Agilex™ 5 FPGAs and SoCs
2.1. Byte Enable in Agilex™ 5 Embedded Memory Blocks
2.2. Address Hold 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
3.1. Consider the Memory Block Selection
3.2. Consider the Concurrent Write 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. Consider Registering the Memory Output
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
4.2.1. 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
4.3.1. 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
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2.2. Address Hold Support
The Agilex™ 5 embedded memory blocks support address hold. When enabled (setting the addressstall signal to 1), this feature captures and holds the previous address value until the next clock cycle. This can be useful for pipeline control, metastability avoidance, or specific asynchronous operations.
Note:
- Simple dual-port mode only: Address latching is only supported in simple dual-port mode. It's not available in other dual-port configurations or single-port mode.
- First clock cycle restriction: The addressstall signal cannot be asserted during the first clock cycle of operation after device configuration. Doing so might result in an unpredictable data output due to potential initialization issues.
- Dual-port considerations: When using dual-port memory blocks, each port has its own independent addressstall signal. This allows you to control address latching for each port individually.
Figure 2. Address Hold This figure shows an address hold block diagram
Figure 3. Address Hold During Read Cycle This figure shows the address hold behavior during read cycle.
Figure 4. Address Hold During Write Cycle This figure shows the address hold behavior during write cycle.