This document is a technical note on using Analog Devices' DSP components and development tools. It mainly discusses the booting procedure of the ADSP-21065L from an EPROM. The document also mentions some considerations regarding DMA.
This document provides specific technical guidance on booting the ADSP-21065L Digital Signal Processor from an EPROM using the VisualDSP 4.1 development environment. It addresses documentation changes, anomalies related to wait states in specific chip revisions, and differences in memory mapping between revisions.
The text details workarounds for booting with EPROMs larger than 1 MBit, including setting specific address bits in the DMA Index Register. It also covers simulation limitations, SDRAM controller initialization requirements, and instructions for modifying the boot loader source code for custom SDRAM configurations.
The boot memory space is limited to 128 kByte (1 MBit) maximum because the external port DMA index register is initialized to 0x02.0000.
The Hex Start Address must be set to 0x02.0000 in the VisualDSP Load Property Page.
Revision 0.0 initializes the WAIT register to 0x200D.6B5A, which causes the processor to wait for the external ACKnowledge signal only.