AN 100: In-System Programmability Guidelines

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ID 683546
Date 9/22/2014
Public
Document Table of Contents
Document Table of Contents x
1. In-System Programmability Guidelines
1. In-System Programmability Guidelines x
1.1. General ISP Guideline 1.2. IEEE Std. 1149.1 Signals 1.3. Sequential versus Concurrent Programming 1.4. ISP Troubleshooting Guidelines 1.5. ISP through Embedded Processors 1.6. ISP through In-Circuit Testers 1.7. Document Revision History
1.1. General ISP Guideline x
1.1.1. Operating Conditions 1.1.2. User Flash Memory Operations During In-System Programming 1.1.3. Interrupting In-System Programming 1.1.4. MultiVolt Devices and Power-Up Sequences 1.1.5. I/O Pins Tri-Stated During In-System Programming 1.1.6. Pull-Up and Pull-Down of JTAG Pins During In-System Programming
1.1.1. Operating Conditions x
1.1.1.1. ISP Voltage 1.1.1.2. Input Voltages
1.2. IEEE Std. 1149.1 Signals x
1.2.1. TCK Signal 1.2.2. Programming Through a Download Cable 1.2.3. Disabling IEEE Std. 1149.1 Circuitry 1.2.4. Working with Different Voltage Levels
1.3. Sequential versus Concurrent Programming x
1.3.1. Sequential Programming 1.3.2. Concurrent Programming 1.3.3. Selecting Sequential or Concurrent Programming 1.3.4. Devices in Different Modes
1.4. ISP Troubleshooting Guidelines x
1.4.1. Invalid ID and Unrecognized Device Messages 1.4.2. Verify the JTAG Chain Continuity 1.4.3. Check the Voltage Levels of the Board During In-System Programming 1.4.4. Random Signals on JTAG Pins 1.4.5. Software Issues
1.5. ISP through Embedded Processors x
1.5.1. Processor and Memory Requirements 1.5.2. Porting the Jam Player
1. In-System Programmability Guidelines

1.4.3. Check the Voltage Levels of the Board During In-System Programming

Monitor the VCCINT or VCCA, VCC_ONE/VCC and VCCIO signal for all banks on your JTAG chain with an oscilloscope.

Set the trigger to the minimum level listed in the “Recommended Operating Conditions” table of the appropriate Device Family Datasheet. If a trigger occurs during in-system programming, the devices may need more current than is being supplied by the existing power supply. You can replace the existing power supply with one that provides more current.

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