Analog Devices EE-85 Recommended Handling of Unused SHARC Pins

About this manual

This document is Engineer to Engineer Note EE-85, a technical note from Analog Devices regarding the handling of unused pins on the ADSP-2106x (SHARC) processors. The note explains that while the processor contains 240 pins, several are only necessary for specific functions. If an application does not utilize a specific function, the associated pins may still require a connection rather than being left floating (unconnected).

What's inside

• Introduction
• Link Ports
• Serial Ports
• External Interface
• DMA Requests
• Interrupt Requests
• JTAG
• Miscellaneous
• Reserved Pins
• Required Pins

Specifications

Frequently asked questions

Can Link Port data, clock, and acknowledge lines be left floating?

Yes, they can be left floating if unused because they contain internal pull-up resistors.

How should unused Transmit Frame Sync and Receive Frame Sync lines be handled?

They should be pulled or tied high to prevent unwanted power consumption if the serial ports are inadvertently enabled.

What is the recommended handling for the Test Reset (TRST) pin?

The test reset pin must be asserted (pulsed) low after power up if the JTAG emulator will not be used.

Which pins are reserved and should always be left unconnected?

The ICSA and NC pins are reserved and should always be left unconnected.