Intel® MAX™ 10 Embedded Memory User Guide

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ID 683431
Date 5/05/2023
Public
Document Table of Contents
Document Table of Contents x
1. Intel® MAX® 10 Embedded Memory Overview 2. Intel® MAX® 10 Embedded Memory Architecture and Features 3. Intel® MAX® 10 Embedded Memory Design Consideration 4. RAM: 1-Port IP Core References 5. RAM: 2-PORT IP Core References 6. ROM: 1-PORT IP Core References 7. ROM: 2-PORT IP Core References 8. FIFO IP Core References 9. Shift Register (RAM-based) IP Core References 10. ALTMEMMULT IP Core References 11. Document Revision History for the Intel® MAX® 10 Embedded Memory User Guide
2. Intel® MAX® 10 Embedded Memory Architecture and Features x
2.1. Intel® MAX® 10 Embedded Memory General Features 2.2. Intel® MAX® 10 Embedded Memory Operation Modes 2.3. Intel® MAX® 10 Embedded Memory Clock Modes 2.4. Intel® MAX® 10 Embedded Memory Configurations
2.1. Intel® MAX® 10 Embedded Memory General Features x
2.1.1. Control Signals 2.1.2. Parity Bit 2.1.3. Read Enable 2.1.4. Read-During-Write 2.1.5. Byte Enable 2.1.6. Packed Mode Support 2.1.7. Address Clock Enable Support 2.1.8. Asynchronous Clear
2.1.5. Byte Enable x
2.1.5.1. Byte Enable Controls 2.1.5.2. Data Byte Output 2.1.5.3. RAM Blocks Operations
2.1.7. Address Clock Enable Support x
2.1.7.1. Address Clock Enable During Read Cycle Waveform 2.1.7.2. Address Clock Enable During Write Cycle Waveform
2.1.8. Asynchronous Clear x
2.1.8.1. Resetting Registers in M9K Blocks
2.2. Intel® MAX® 10 Embedded Memory Operation Modes x
2.2.1. Supported Memory Operation Modes
2.3. Intel® MAX® 10 Embedded Memory Clock Modes x
2.3.1. Asynchronous Clear in Clock Modes 2.3.2. Output Read Data in Simultaneous Read and Write 2.3.3. Independent Clock Enables in Clock Modes
2.4. Intel® MAX® 10 Embedded Memory Configurations x
2.4.1. Port Width Configurations 2.4.2. Memory Configurations for Single-Port Modes 2.4.3. Memory Configurations for Dual-Port Modes 2.4.4. Maximum Block Depth Configuration
3. Intel® MAX® 10 Embedded Memory Design Consideration x
3.1. Implement External Conflict Resolution 3.2. Customize Read-During-Write Behavior 3.3. Consider Power-Up State and Memory Initialization 3.4. Control Clocking to Reduce Power Consumption 3.5. Selecting Read-During-Write Output Choices
3.2. Customize Read-During-Write Behavior x
3.2.1. Same-Port Read-During-Write Mode 3.2.2. Mixed-Port Read-During-Write Mode
3.2.2. Mixed-Port Read-During-Write Mode x
3.2.2.1. Mixed-Port Read-During-Write Operation with Dual Clocks
4. RAM: 1-Port IP Core References x
4.1. RAM: 1-Port IP Core Signals For Intel® MAX® 10 Devices 4.2. RAM: 1-Port IP Core Parameters For Intel® MAX® 10 Devices
5. RAM: 2-PORT IP Core References x
5.1. RAM: 2-Ports IP Core Signals (Simple Dual-Port RAM) For Intel® MAX® 10 Devices 5.2. RAM: 2-Port IP Core Signals (True Dual-Port RAM) for Intel® MAX® 10 Devices 5.3. RAM: 2-Port IP Core Parameters for Intel® MAX® 10 Devices
6. ROM: 1-PORT IP Core References x
6.1. ROM: 1-PORT IP Core Signals For Intel® MAX® 10 Devices 6.2. ROM: 1-PORT IP Core Parameters for Intel® MAX® 10 Devices
7. ROM: 2-PORT IP Core References x
7.1. ROM: 2-PORT IP Core Signals for Intel® MAX® 10 Devices 7.2. ROM: 2-Port IP Core Parameters For Intel® MAX® 10 Devices
8. FIFO IP Core References x
8.1. FIFO IP Core Signals for Intel® MAX® 10 Devices 8.2. FIFO IP Core Parameters for Intel® MAX® 10 Devices 8.3. FIFO Functional Timing Requirements 8.4. SCFIFO ALMOST_EMPTY Functional Timing
9. Shift Register (RAM-based) IP Core References x
9.1. Shift Register (RAM-based) IP Core Signals for Intel® MAX® 10 Devices 9.2. Shift Register (RAM-based) IP Core Parameters for Intel® MAX® 10 Devices
10. ALTMEMMULT IP Core References x
10.1. ALTMEMMULT IP Core Signals for Intel® MAX® 10 Devices 10.2. ALTMEMMULT IP Core Parameters for Intel® MAX® 10 Devices
1. Intel® MAX® 10 Embedded Memory Overview
2. Intel® MAX® 10 Embedded Memory Architecture and Features
3. Intel® MAX® 10 Embedded Memory Design Consideration
4. RAM: 1-Port IP Core References
5. RAM: 2-PORT IP Core References
6. ROM: 1-PORT IP Core References
7. ROM: 2-PORT IP Core References
8. FIFO IP Core References
9. Shift Register (RAM-based) IP Core References
10. ALTMEMMULT IP Core References
11. Document Revision History for the Intel® MAX® 10 Embedded Memory User Guide

8.4. SCFIFO ALMOST_EMPTY Functional Timing

In SCFIFO, the almost_empty is asserted only when the usedw is less than the almost_empty_value that you set. The almost_empty signal does not consider the data readiness at the output. When the almost_empty_value is set too low, it is possible to observe that SCFIFO asserts the empty signal without asserting the almost_emtpy signal.

Figure 28. Example of empty Signal Assertion without Asserting almost_empty Signal

In this example, the almost_empty_value is 1 which means the almost_empty asserts when usedw is 0. There are three words in the FIFO before the read request is received. After the first read, the wrreq asserts and the rdreq signal remains high. The usedw remains at 2. In the next cycle, the wrreq de-asserts but there is another rdreq going on. The usedw decrease to 1 and the almost_empty signal remains low. However, the write data has not been written into the FIFO due to the write latency. The empty signal asserts to indicate the FIFO is empty.

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