Intel® Agilex™ Embedded Memory User Guide

ID 683241
Date 4/25/2022
Public

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2.4. Memory Blocks Error Correction Code Support

ECC detects and corrects data errors at the output of the memory.

Only M20K blocks and eSRAM blocks support the ECC feature.

If you engage the ECC feature, you cannot use the following features:

  • Byte enable
  • Coherent read
  • Mixed data width

M20K Blocks

For M20K blocks, ECC performs single-error correction, double-adjacent-error correction, and triple-adjacent-error correction in a 32-bit word. However, ECC cannot guarantee detection or correction of non-adjacent two-bit or more errors.

The M20K blocks have built-in support for ECC when in ×32-wide simple dual-port mode.

  • When you engage the ECC feature, the M20K runs slower than the non-ECC simple dual-port mode. However, you can enable optional ECC pipeline registers before the output decoder to achieve higher performance compared to non-pipeline ECC mode at the expense of one-cycle latency.
  • Two ECC status flag signals—e (error) and ue (uncorrectable error) indicate the M20K ECC status. The status flags are part of the regular outputs from the memory block.

eSRAM Blocks

For eSRAM blocks, ECC performs single-error correction and double-error detection in a 64-bit word.

The eSRAM blocks have built-in support for ECC when in ×64-wide simple dual-port mode.
  • Two ECC status flag signals— p{0..3}_eccflags[1] (error corrected) and p{0..3}_eccflags[0] (error detected) indicate the eSRAM ECC status.

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