Intel PC28F256P30BF: A Comprehensive Technical Overview of the 256-Mbit Parallel NOR Flash Memory
The Intel PC28F256P30BF stands as a significant component in the lineage of non-volatile memory solutions, representing a robust 256-Mbit Parallel NOR Flash memory device engineered for high-performance, high-reliability applications. This memory chip is a testament to Intel's leadership in creating memory solutions that meet the stringent demands of embedded systems, networking equipment, telecommunications infrastructure, and industrial control systems.
Architecture and Core Features
Organized as 32M x 8 bits, this device offers a straightforward, byte-wide data interface that simplifies system design and allows for efficient data access. Its core architecture is built on a multi-level cell (MLC) technology, which enables the high density of 256 megabits on a single chip. A key feature of this family is its asynchronous page mode operation, which significantly enhances read performance. By allowing rapid sequential access to data within a selected "page" of memory, it effectively reduces the average read latency, a critical factor in boosting the overall throughput of the system.
Performance and Interface
Operating from a 3.0V single power supply (VCC) for the core logic and a separate 3.0V supply (VCCQ) for the output buffers, the PC28F256P30BF is designed for modern low-power systems. Its performance is characterized by fast access times, with the '30' in its suffix denoting an initial access of 30ns (for the first word) and a subsequent page access time of just 25ns. The parallel interface provides a familiar control signal set, including Chip Enable (CE), Output Enable (OE), and Write Enable (WE), offering designers fine-grained control over memory operations.
Reliability and Endurance
This device is renowned for its exceptional reliability. It offers a minimum endurance of 100,000 program/erase cycles per sector, a figure that far exceeds many contemporary storage solutions. Data retention is guaranteed for up to 20 years, ensuring long-term integrity of stored code and data. These characteristics make it an ideal choice for storing critical boot code, application firmware, and real-time operating systems that must remain intact and executable for the lifetime of the product.
Advanced Functionality
Beyond basic read and write operations, the PC28F256P30BF incorporates a suite of advanced features. It supports a hardware-based write protection scheme that blocks accidental modification of critical memory regions. Furthermore, it integrates intelligent algorithms for Embedded Program and Erase operations, managed by an on-chip write state machine. This offloads the burden of complex timing and voltage control from the external processor, simplifying software driver development and ensuring optimal and reliable memory cell operation.
Application Space
The combination of high speed, reliability, and random access capability solidifies its role primarily in execute-in-place (XIP) applications. In these systems, the microprocessor can directly fetch and execute code from the NOR Flash memory without the need to first shadow it into RAM, reducing system cost and complexity. This is paramount in applications requiring instant-on capability and deterministic boot times, such as in routers, switches, and aerospace systems.
ICGOOODFIND
In summary, the Intel PC28F256P30BF is a high-density, high-performance parallel NOR Flash memory solution. Its fast asynchronous page-mode reads, exceptional endurance and retention, and advanced embedded management features make it a cornerstone technology for mission-critical embedded systems where reliability, speed, and direct code execution are non-negotiable requirements.
Keywords:
1. Parallel NOR Flash
2. Execute-in-Place (XIP)
3. Asynchronous Page Mode
4. Program/Erase Endurance
5. Non-Volatile Memory
