Intel RC28F320J3C110: A Deep Dive into the 32Mb 3V Advanced+ Boot Block Flash Memory

In the realm of embedded systems and legacy computing, reliable non-volatile storage remains a cornerstone. The Intel RC28F320J3C110 stands as a significant solution from its era, representing a robust implementation of flash memory technology designed for demanding applications. This 32-megabit (4MB), single 3-volt power supply flash memory chip is a hallmark of Intel's Advanced+ Boot Block architecture, engineered for both flexibility and reliability.

A primary feature of this device is its Advanced+ Boot Block architecture, which provides an intelligent sector partitioning scheme. This design includes a combination of 8KB, 16KB, and 64KB parameter blocks alongside larger 128KB blocks. Crucially, it features a top or bottom located boot block, a dedicated sector that contains the initial code executed by a processor upon power-up (e.g., the BIOS or bootloader). This physical separation protects this critical code from accidental overwrites, enhancing system reliability and simplifying the update process for other firmware sections.

The device operates on a single 3.0-volt VCC supply, making it suitable for low-power and portable applications common in its production period. Its command set is JEDEC standard, allowing compatibility with a wide range of microprocessors and microcontrollers. For in-system programming and updates, it supports a 12.0-volt VPP programming voltage,

which accelerates the write and erase operations. Despite this requirement, the architecture is designed to protect the memory from being accidentally erased or programmed during power transitions or system noise.

Performance-wise, the RC28F320J3C110 offers access times as low as 110ns, ensuring that it could keep pace with the processors of its time without introducing significant wait states. Its endurance is specified for a minimum of 100,000 write/erase cycles per sector, a testament to the robustness of the underlying floating-gate technology. Furthermore, it guarantees data retention for up to 20 years, ensuring long-term data integrity.

This memory was predominantly found in a wide array of professional and consumer electronics, including networking equipment (routers, switches), telecommunications infrastructure, industrial control systems, and early automotive computing modules. Its combination of a secure boot block, flexible sector architecture, and proven endurance made it a trusted choice for systems where firmware integrity was paramount.

ICGOODFIND: The Intel RC28F320J3C110 is a quintessential example of purpose-built memory technology. Its Advanced+ Boot Block architecture with a protected sector ensured reliable system booting, while its single 3V power operation and high endurance made it a versatile and durable solution for the embedded market of its time.

Keywords: Boot Block, Flash Memory, 3.0-volt VCC, Non-volatile Storage, Sector Erase Architecture.