Analog Devices EE-19 Boot Paging II: Maximizing Boot-Memory Efficiency on the ADSP-21xx family Manual

About this manual

This document outlines various techniques to increase the efficiency of standard boot memory in 21xx systems, specifically excluding the ADSP-218x family. It details methods such as maximizing boot-page allocation, selecting the smallest possible boot memory device, and creating multi-bank boot-page systems with 16 or 32 pages.

The guide also covers mapping program and data memory into unused portions of boot memory for large amounts of 8-bit wide storage and explains how to modify the boot memory image file (*.bnm) to reflect hardware configuration changes. An example system using an ADSP-2115 is described to illustrate these concepts.

What's inside

• Boot Memory Overview
• Basic Boot Memory Interface
• Removing Unused Memory
• Creating Multiple Boot-Page Banks
• Mapping PM or DM Space into Boot Memory
• Modifying the Boot Memory Image file

Frequently asked questions

Which DSP family does this document cover?

The document covers the ADSP-21xx family of Digital Signal Processors, excluding the ADSP-218x.

What is the minimum size of boot memory required for a standard interface?

The standard interface requires a minimum of 512 Kbits of boot memory.

How are unused address lines handled when creating multiple boot-page banks?

Unused address lines can be tied to a memory mapped flip-flop in a DSP system or connected to hard switches.