mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 479

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

Chapter 22
Flash Memory Controller (FMC)
22.1 Introduction
The Flash Memory Controller (FMC) is a memory acceleration unit that provides:
22.1.1 Overview
The Flash Memory Controller manages the interface between the chip and the 32-bit
program flash memory and FlexMemory (FlexNVM as well as FlexRAM used as
EEPROM). The FMC receives status information detailing the configuration of the flash
memory and FlexMemory and uses this information to ensure a proper interface. The
FMC supports 8-bit, 16-bit, and 32-bit read operations from the program flash memory
and FlexNVM used as data flash memory. A write operation to program flash or
FlexNVM used as data flash memory results in a bus error. The FMC interface to
FlexNVM and FlexRAM when they are used as EEPROM allows both read and write 8-
bit, 16-bit, and 32-bit operations.
In addition, for program flash memory, the FMC provides two separate mechanisms for
accelerating the interface between the device and the flash. A 32-bit speculation buffer
can prefetch the next 32-bit flash memory location, and a 4-way, 4-set program flash
memory cache can store previously accessed program flash memory data for quick access
times.
22.1.2 Features
The FMC's features include:
Freescale Semiconductor, Inc.
• an interface between the chip and the 32-bit program flash memory and FlexMemory
• a buffer and a cache that can accelerate program flash memory data transfers.
(FlexNVM and FlexRAM used as EEPROM).
MCF51JF128 Reference Manual, Rev. 2, 03/2011
Preliminary
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