Chapter 15
Flash Acceleration Unit (FAU)
15.1 Flash Acceleration Unit (FAU)
15.1.1 Introduction
The Flash Acceleration Unit (FAU) is a memory acceleration unit. It includes a buffer
and a cache that can accelerate program flash memory data transfers. In addition, this
module provides two separate mechanisms for accelerating the interface between bus
masters and program flash memory. A 64-bit speculation buffer can prefetch the next 64-
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.
15.1.2 Modes of operation
The FAU operates only when a bus master accesses the program flash memory or
FlexMemory.
In terms of chip power modes:
• The FAU operates only in Run and Wait modes, including VLPR and VLPW modes.
• For any power mode where the program flash memory or FlexMemory cannot be
accessed, the FAU is disabled.
15.1.3 External signal description
The FAU has no external (off-chip) signals.
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