Intel® Agilex™ Embedded Memory User Guide

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ID 683241
Date 12/02/2022
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Document Table of Contents
Document Table of Contents x
1. Intel® Agilex™ Embedded Memory Overview 2. Intel® Agilex™ Embedded Memory Architecture and Features 3. Intel® Agilex™ Embedded Memory Design Considerations 4. Intel® Agilex™ Embedded Memory IP References 5. Intel® Agilex™ Embedded Memory Debugging 6. Intel® Agilex™ Embedded Memory User Guide Archives 7. Document Revision History for the Intel® Agilex™ Embedded Memory User Guide
1. Intel® Agilex™ Embedded Memory Overview x
1.1. Intel® Agilex™ Embedded Memory Features
2. Intel® Agilex™ Embedded Memory Architecture and Features x
2.1. Byte Enable in Intel® Agilex™ 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. Intel® Agilex™ Embedded Memory Clocking Modes 2.6. Intel® Agilex™ 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 2.13. Intel® Agilex™ Supported Embedded Memory IPs
2.1. Byte Enable in Intel® Agilex™ 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
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. Intel® Agilex™ 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. Intel® Agilex™ Embedded Memory Configurations x
2.6.1. Mixed-Width Port Configurations
2.8. Coherent Read Memory x
2.8.1. Forwarding Logic
3. Intel® Agilex™ 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 Intel® Quartus® Prime Software for Memory 3.9. Consider the Memory Depth Setting
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. Intel® Agilex™ Embedded Memory IP References x
4.1. On Chip Memory RAM and ROM Intel® FPGA IP Cores 4.2. eSRAM Intel® Agilex™ FPGA IP 4.3. FIFO Intel® FPGA IP 4.4. 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. eSRAM Intel® Agilex™ FPGA IP x
4.2.1. Release Information for eSRAM Intel® Agilex™ FPGA IP 4.2.2. eSRAM System Features 4.2.3. eSRAM Intel® Agilex™ FPGA IP Parameters 4.2.4. eSRAM Intel® 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 Intel® FPGA IP x
4.3.1. Release Information for FIFO Intel® FPGA 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. Design Example 4.3.14. Gray-Code Counter Transfer at the Clock Domain Crossing 4.3.15. Guidelines for Embedded Memory ECC Feature 4.3.16. FIFO Intel® FPGA IP Parameters 4.3.17. 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. FIFO Signals 4.3.3.5. 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) Intel® FPGA IP x
4.4.1. Release Information for Shift Register (RAM-based) Intel® FPGA IP 4.4.2. Shift Register (RAM-based) Intel® FPGA IP Features 4.4.3. Shift Register (RAM-based) Intel® FPGA IP General Description 4.4.4. Shift Register (RAM-based) Intel® FPGA IP Parameter Settings 4.4.5. Shift Register Ports and Parameters Setting
1. Intel® Agilex™ Embedded Memory Overview
2. Intel® Agilex™ Embedded Memory Architecture and Features
3. Intel® Agilex™ Embedded Memory Design Considerations
4. Intel® Agilex™ Embedded Memory IP References
5. Intel® Agilex™ Embedded Memory Debugging
6. Intel® Agilex™ Embedded Memory User Guide Archives
7. Document Revision History for the Intel® Agilex™ Embedded Memory User Guide

3.3.2. Mixed-Port Read-During-Write Mode

The mixed-port read-during-write mode applies to simple dual-port RAM mode, true dual-port, and simple quad-port RAM. Two ports perform read and write operations on the same memory address using the same clock: one port reading from the address, and the other port writing to it.
Table 14.  Output Modes for RAM in Mixed-Port Read-During-Write Mode
Output Mode Memory Type Description Supported Operation Mode
New Data MLAB

A read-during-write operation to different ports causes the MLAB registered output to reflect the New Data on the next rising edge after the data is written to the MLAB memory.

This mode is available only if the output is registered.

  • Simple Dual-port RAM
Old Data M20K, MLAB

A read-during-write operation to different ports causes the RAM output to reflect the Old Data value at that particular address.

For MLAB, this mode is available only if the output is registered.

  • Simple Dual-port RAM
Don't Care M20K, MLAB

The RAM produces Don't Care or Unknown value.

  • For M20K, the Intel® Quartus® Prime software does not analyze the timing between write and read operations.
  • For MLAB, to enable this feature, you must include the RDW_DONT_CARE_IS_X define flag in the simulation command when compiling the embedded memory simulation model and when running the simulation.
    The following is an example of adding the define flag into the simulation command: 
    vlog -sv -timescale 1ps/1ps +define+RDW_DONT_CARE_IS_X -work msim_precompile $env(QUARTUS_DIR)/eda/sim_lib/altera_lnsim.sv
  • Simple Dual-port RAM
  • True Dual-port RAM (for M20K only)
New_a_old_b M20K The read-during-write operation to different ports causes the RAM output to reflect new data at port A and old data at port B.
  • Quad-port RAM
Table 15.  Mixed Port Read-During-Write Output BehaviorsThis table lists and describes the output behaviors of the mixed-port read-during-write mode. These behaviors are applicable only for MLAB blocks.
RAM: 2-PORT Intel® FPGA IP Settings Output Behavior
Parameter Enabled Parameter Options altera_syncram Parameter

(read_during_write_mode_mixed_ ports)

Output Data when Read-During-Write MLAB Atom (visible in Chip Planner)
Mixed Port Read-During-Write for Single Input Clock RAM

How should the q_a and q_b outputs behave when reading a memory location that is being written from the other ports?

 Old Data old_data Old data 4 New Data
New Data new_data New data New Data
Don't Care dont_care Don't care 5 Don't Care
Figure 24. Mixed-Port Read-During-Write: New Data ModeThis figure shows a sample functional waveform of mixed-port read-during-write behavior for the New Data mode.


Figure 25. Mixed-Port Read-During-Write: Old Data ModeThis figure shows a sample functional waveform of mixed-port read-during-write behavior for the Old Data mode.


Figure 26. Mixed-Port Read-During-Write: Don't Care ModeThis figure shows a sample functional waveform of mixed-port read-during-write behavior for the Don't Care mode. This behavior is only applicable for M20K blocks.


Figure 27. Mixed-Port Read-During-Write: New_a_old_b ModeThis figure shows a sample functional waveform of mixed-port read-during-write behavior for the New_a_old_b mode.
4 Old data is achieved through external soft logic as the MLAB blocks only natively supports new data.
5 The output data is don't care because the IP does not guarantee metastability for the output data when read-during-write.
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