Intel® Arria® 10 Hard Processor System Technical Reference Manual

ID 683711
Date 1/10/2023
Public

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16.4.5. Local Memory Buffer

The SRAM local memory buffer is a 128 by 32-bit (512 total bytes) memory and includes support for error correction code (ECC). The ECC controller is able to detect single-bit and double-bit errors, and correct the single-bit errors. The ECC operation and functionality is programmable through the ECC register slave interface, as shown in the Quad SPI Flash Controller Block Diagram and System Integration section. The ECC register interface provides host access to configure the ECC logic as well as inject bit errors into the memory. It also provides host access to memory initialization hardware used to clear out the memory contents including the ECC bits.

To prevent spurious ECC errors, software must use the memory initialization block in the ECC controller to initialize the entire memory data and ECC bits. The initialization block clears the memory data. Enabling initialization in the ECC Control Register is independent of enabling the ECC. The ECC controller generates interrupts upon occurrences of single- and double-bit errors. The interrupt requests are sent to the system manager which routes them to the General Interrupt Controller (GIC).

The SRAM has two partitions, with the lower partition reserved for indirect read operations and the upper partition for indirect write operations. The size of the partitions is specified in the SRAM partition register (srampart), based on 32‑bit word sizes. For example, to specify four bytes of storage, write the value 1. The value written to the indirect read partition size field (addr) defines the number of entries reserved for indirect read operations. For example, write the value 32 (0x20) to partition the 128-entry SRAM to 32 entries (25%) for read usage and 96 entries (75%) for write usage.