Hi all,
I am having some problems with a custom board that is based on ADSP-21489. I have been able to use USB-ICE to communicate with the DSP on the custom board for quite a number of days. However, recently I keep getting the following errors in both VisualDSP as well as CrossCore Embedded Studio:
| Unable to halt processor. JTAG communication failed. | |
| You may need to exit the debugger and reset the target hardware to correct this problem. |
If I choose Do Not Disturb instead of Halt Then Reset in the USB-ICE device properties, I see that the processor is "Running" but when I halt or reset the core manually I get these messages:
| JTAG scan failed - Check target power and emulator connection. | |
| JTAG scan failed - Check target power and emulator connection. | |
| Failed first NOP block scan. | |
| JTAG scan failed - Check target power and emulator connection. | |
| Failed second NOP block scan. | |
| JTAG scan failed - Check target power and emulator connection. | |
| JTAG scan failed - Check target power and emulator connection. | |
| JTAG scan failed - Check target power and emulator connection. | |
| DSP could not generate emulator interrupt | |
| JTAG scan failed - Check target power and emulator connection. |
I am using an external oscillator as well as ADM809 supervisory IC to ensure RESET is low for at least 240ms at power up.
Since I have established JTAG connection with the DSP on the custom board before, the JTAG connection should be OK.
Any ideas on where to start troubleshooting will be helpful.
