Intel JS28F128J3D-75A: A 128-Megabit Parallel NOR Flash Memory for Embedded Systems
In the realm of embedded systems, where reliability, performance, and deterministic operation are paramount, the choice of non-volatile memory is a critical design decision. The Intel JS28F128J3D-75A stands as a prominent solution in this space, representing a high-performance 128-megabit (16MB) parallel NOR Flash memory device. Engineered for applications requiring fast read access and robust execution-in-place (XIP) capabilities, this memory component is a cornerstone for systems that cannot tolerate the latency or uncertainty of storage fetched from serial memories.
A key attribute of the JS28F128J3D-75A is its parallel interface, which provides a 16-bit data bus. This architecture is fundamental to its high-speed performance, enabling a maximum random read access time of 75ns. This makes it exceptionally suited for storing boot code, operating system kernels, and critical application firmware that the system's microprocessor can execute directly without needing to first copy the code into RAM. This Execution-In-Place (XIP) capability simplifies system architecture, reduces component count, and ensures instant-on performance.
The device is organized as 128 Megabits, configured as 8,388,608 words by 16 bits. This substantial density allows it to accommodate increasingly large firmware images common in modern embedded applications, from complex industrial automation controllers and networking routers to sophisticated medical devices and automotive systems. Its 75ns maximum access time ensures that even high-speed processors can run efficiently with minimal wait states, maintaining overall system throughput.
Beyond raw speed, the JS28F128J3D-75A is built for reliability and longevity. It features a minimum 100,000 write/erase cycles per sector, a critical specification for firmware that may require field updates or data logging. The memory array is divided into multiple uniform 128-Kbyte sectors, each of which can be individually erased, locked, or unlocked. This granularity provides firmware designers with flexible memory management options, allowing them to protect critical boot code while leaving other sectors open for updates or parameter storage.
The device operates on a single 3.3V power supply, making it compatible with a wide range of modern low-voltage microprocessors and microcontrollers. It supports the Common Flash Memory Interface (CFI), which allows host software to automatically query the device to determine its vendor, density, and electrical parameters. This simplifies system design and enables the use of generic flash drivers.
In summary, the Intel JS28F128J3D-75A is a workhorse of the embedded world, offering a proven blend of high density, fast parallel access, and sector-based management. It delivers the performance and reliability needed for the most demanding embedded applications where failure is not an option.
ICGOOODFIND: The Intel JS28F128J3D-75A is a quintessential parallel NOR flash memory, highly valued in embedded design for its fast read performance, XIP capability, and robust sector protection. It remains a top-tier choice for developers prioritizing deterministic boot-up and execution directly from flash.
Keywords:
1. Parallel NOR Flash
2. Execution-In-Place (XIP)
3. Embedded Systems
4. Non-Volatile Memory
5. Sector Erase
