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1. About the External Memory Interfaces Intel Agilex® 7 M-Series FPGA IP
2. Intel Agilex® 7 M-Series FPGA EMIF IP – Introduction
3. Intel Agilex® 7 M-Series FPGA EMIF IP – Product Architecture
4. Intel Agilex® 7 M-Series FPGA EMIF IP – End-User Signals
5. Intel Agilex® 7 M-Series FPGA EMIF IP – Simulating Memory IP
6. Intel Agilex 7 M-Series FPGA EMIF IP – DDR4 Support
7. Intel Agilex® 7 M-Series FPGA EMIF IP – DDR5 Support
8. Intel Agilex 7 M-Series FPGA EMIF IP – LPDDR5 Support
9. Intel Agilex® 7 M-Series FPGA EMIF IP – Timing Closure
10. Intel Agilex® 7 M-Series FPGA EMIF IP – Controller Optimization
11. Intel Agilex® 7 M-Series FPGA EMIF IP – Debugging
12. Document Revision History for External Memory Interfaces Intel Agilex® 7 M-Series FPGA IP User Guide
3.1.1. Intel Agilex® 7 M-Series EMIF Architecture: I/O Subsystem
3.1.2. Intel Agilex® 7 M-Series EMIF Architecture: I/O SSM
3.1.3. Intel Agilex® 7 M-Series EMIF Architecture: I/O Bank
3.1.4. Intel Agilex® 7 M-Series EMIF Architecture: I/O Lane
3.1.5. Intel Agilex® 7 M-Series EMIF Architecture: Input DQS Clock Tree
3.1.6. Intel Agilex® 7 M-Series EMIF Architecture: PHY Clock Tree
3.1.7. Intel Agilex® 7 M-Series EMIF Architecture: PLL Reference Clock Networks
3.1.8. Intel Agilex® 7 M-Series EMIF Architecture: Clock Phase Alignment
6.2.4.1. Address and Command Pin Placement for DDR4
6.2.4.2. DDR4 Data Width Mapping
6.2.4.3. General Guidelines
6.2.4.4. x4 DIMM Implementation
6.2.4.5. Specific Pin Connection Requirements
6.2.4.6. Command and Address Signals
6.2.4.7. Clock Signals
6.2.4.8. Data, Data Strobes, DM/DBI, and Optional ECC Signals
6.3.5.1. Single Rank x 8 Discrete (Component) Topology
6.3.5.2. Single Rank x 16 Discrete (Component) Topology
6.3.5.3. ADDR/CMD Reference Voltage/RESET Signal Routing Guidelines for Single Rank x 8 and Single Rank x 16 Discrete (Component) Topologies
6.3.5.4. Skew Matching Guidelines for DDR4 Discrete Configurations
6.3.5.5. Power Delivery Recommendations for DDR4 Discrete Configurations
6.3.5.6. Intel Agilex® 7 M-Series EMIF Pin Swapping Guidelines
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7.2.3.1. General Guidelines
You should follow the recommended guidelines when performing pin placement for all external memory interface pins targeting Intel Agilex® 7 M-Series devices, whether you are using the hard memory controller or your own solution.
Observe the following general guidelines when placing pins for your Intel Agilex® 7 M-Series external memory interface:
- Ensure that the pins of a single external memory interface reside on the same edge I/O.
- An external memory interface can occupy one or more banks on the same edge. When an interface must occupy multiple banks, ensure that those banks are adjacent to one another.
- If an I/O bank is shared between two interfaces—meaning that two sub-banks belong to two different EMIF interfaces—then both the interfaces must share the same voltage.
- Sharing of I/O lanes within a sub-bank for two different EMIF interfaces is not permitted; I/O lanes within a sub-bank can be assigned to one EMIF interface only.
- Any pin in the same bank that is not used by an external memory interface may not be available for use as a general purpose I/O pin:
- For fabric EMIF, unused pins in an I/O lane assigned to an EMIF interface cannot be used as general-purpose I/O pins. In the same sub-bank, pins in an I/O lane that is not assigned to an EMIF interface, can be used as general-purpose I/O pins.
- All address and command pins and their associated clock pins (CK_t and CK_c) must reside within a single sub-bank. The sub-bank containing the address and command pins is identified as the address and command sub-bank.
- The address and command pins and their associated clock pins in the address and command bank must follow a fixed pin-out scheme, as defined in the Intel Agilex® 7 M-Series External Memory Interface Pin Information file.
- An unused I/O lane in the address and command sub-bank can serve to implement a data group, such as a x8 DQS group. The data group must be from the same controller as the address and command signals.
- An I/O lane must not be used by both address and command pins and data pins.
- Place read data groups according to the DQS grouping in the pin table and Pin Planner. Read data strobes (such as DQS_t and DQS_c) must reside at physical pins capable of functioning as DQS_t and DQS_c for a specific read data group size. You must place the associated read data pins (DQ), within the same group.
Note: For DDR5 interfaces with x4 components, place DQ pins and DQS entirely in either the upper or lower half of a 12-bit bank sub-group. Consult the pin table for your device to identify the association between DQ pins and DQS pins for x4 mode operation. Additional restrictions apply for x4/x8 DIMM interoperability.
- One of the sub-banks in the device (typically the sub-bank within corner bank 3A) may not be available if you use certain device configuration schemes. For some schemes, there may be an I/O lane available for EMIF data group.
- AVST-8 – This is contained entirely within the SDM, therefore all lanes of sub-bank 3A can be used by the external memory interface.
- AVST-16/AVST-32– Lanes 4, 5, 6, and 7 are all effectively occupied and are not usable by the external memory interface.
- Two memory interfaces cannot share an I/O 48 sub-bank.