ANALOG DEVICES Porting Code from ADSP-21xx to ADSP-219x Manual

About this manual

This document serves as a technical guide for engineers upgrading their designs from the ADSP-218x DSP family to the ADSP-219x. It details the architectural enhancements in the ADSP-219x, such as the unified memory space, 16-bit DAG registers, and increased addressing flexibility. The note aims to minimize intrusive changes to the instruction set while improving C-friendliness and efficiency.

What's inside

• Unified Memory Space
• 16-bit DAG Registers and Memory Paging
• Increased variety in DAG Addressing Modes
• Increased Variety and Types of Jumps and Function Calls
• The ADSP-219x Instruction Pipeline
• Base Registers For Circular Buffers
• System Control Register Space
• Addition of SR as a Dual Accumulator
• Differences In MSTAT Register

Frequently asked questions

What is the intended audience for this application note?

This document is intended for existing users of the ADSP-218x who plan to upgrade their design to the ADSP-219x.

How many DSP clock cycles does a taken branch jump take?

Jumps, calls and returns can take up to 4 DSP clock cycles if the branch is taken.

What is the width of the SR register on the ADSP-219x?

The SR register has been expanded to 40 bits on the ADSP-219x.