Chapter 31 Flash Memory Controller (Fmc) - NXP Semiconductors freescale KV4 Series Reference Manual

Chapter 31
Flash Memory Controller (FMC)
31.1 Introduction
The Flash Memory Controller (FMC) is a memory acceleration unit that provides:
• an interface between the device and the nonvolatile memory.
• buffers that can accelerate flash memory transfers.
31.1.1 Overview
The Flash Memory Controller manages the interface between the device and the flash
memory. The FMC receives status information detailing the configuration of the memory
and uses this information to ensure a proper interface. The following table shows the
supported read/write operations.
Flash memory type
Program flash memory
1. A write operation to program flash memory results in a bus error.
In addition, for bank 0, the FMC provides three separate mechanisms for accelerating the
interface between the device and the flash memory. A 128-bit speculation buffer can
prefetch the next 128-bit flash memory location, and both a 4-way, 2-set cache and a
single-entry 128-bit buffer can store previously accessed flash memory data for quick
access times.
31.1.2 Features
The FMC's features include:
• Interface between the device and the flash memory:
• 8-bit, 16-bit, and 32-bit read operations to program flash memory.
Freescale Semiconductor, Inc.
Read
8-bit, 16-bit, and 32-bit reads
KV4x Reference Manual, Rev. 2, 02/2015
Preliminary
Write
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