Analog Devices ADSP-2191/95/96 DSP Booting Application Note

About this manual

The document details the unique booting scheme for the ADSP-2191/95/96 family of DSPs, which differs from other ADI DSPs like the SHARC series. It explains that upon a hardware reset, the processor is configured to automatically boot via a Loader Kernel located in internal ROM or external memory based on specific pin states.

The guide covers three primary boot modes: executing directly from external memory without a loader kernel, and booting from external sources such as EPROM, Host (UART), SPI, or UART. It provides technical details on the System Configuration Register settings required to select these modes.

What's inside

• Overview
• Hardware Reset
• Software Reset
• Boot Modes
• SPI Booting
• UART Booting
• VisualDSP++ Loader Utility

Frequently asked questions

What character must an external device transmit for UART auto-baud detection?

The Boot Kernel expects the character 0xAA to be transmitted by an external device.

Which byte does the Boot Kernel send back after determining the baud rate?

The Boot Kernel replies with bytes Ox4F and 0x4B, which correspond to 'OK' in ASCII.

What is the recommended maximum bit rate for UART booting over standard cables?

Bit rates above 9600bps are not recommended if the signal passes standard EIA-232 cables.