Intel RC28F256M29EWH: A Comprehensive Technical Overview of the 256-Megabit NOR Flash Memory

The Intel RC28F256M29EWH represents a significant component within the landscape of non-volatile memory solutions. As a 256-megabit (32MB) NOR Flash memory device, it is engineered for applications requiring reliable code storage and execution, often referred to as Execute-In-Place (XIP). This memory is a key enabler in systems where boot reliability, fast read access, and data integrity are non-negotiable.

Fabricated on Intel's advanced 65nm MirrorBit® NOR technology, this device offers a substantial density in a compact form factor. The core operates on a single 3.0V power supply (VCC), simplifying system power design, while a separate 1.8V supply (VCCQ) powers the input/output buffers for enhanced power efficiency and compatibility with low-voltage logic interfaces.

A defining characteristic of this memory is its asynchronous page mode read capability. By accessing data in 32-word (64-byte) pages, it achieves a significantly faster effective read throughput compared to standard asynchronous NOR flash, with access times as low as 25ns for initial access and subsequent page accesses as fast as 15ns. This makes it suitable for high-performance embedded computing.

The device features a Common Flash Interface (CFI) that allows host software to automatically query the flash memory to determine its vendor-specific parameters, such as block size, voltage, and timing information. This simplifies system design and firmware development. The memory array is organized into 128 uniform 256-Kbyte blocks, each of which is individually erasable. This granular erase capability provides flexibility for storing application code, boot code, and configuration parameters.

For reliability and data integrity, the RC28F256M29EWH incorporates several robust features. It includes a hardware-based Advanced Sector Protection mechanism, offering both permanent and temporary locking options for critical memory blocks to prevent accidental corruption. Furthermore, it supports Error Correction Code (ECC) internal to the device, which corrects single-bit errors and detects multi-bit errors, a critical feature for mission-critical applications in aerospace, industrial, and networking systems.

The device offers a standard asynchronous memory interface with a 16-bit-wide data bus, ensuring broad compatibility with various microprocessors and microcontrollers without the complexity of a dedicated memory controller. Its operating temperature range typically spans from -40°C to +85°C, catering to both commercial and industrial environments.

ICGOOODFIND: The Intel RC28F256M29EWH stands out as a high-density, high-reliability NOR Flash solution. Its combination of advanced 65nm process technology, fast page-mode reads, robust sector protection, and integrated ECC solidifies its role as a premier choice for demanding embedded systems where dependable code storage and execution are paramount.

Keywords: NOR Flash Memory, Execute-In-Place (XIP), 65nm MirrorBit® Technology, Common Flash Interface (CFI), Error Correction Code (ECC)