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TMS320F28027: C28xx: Flash Programmer: Device is locked or not connected. Operation cancelled.

Part Number: TMS320F28027
Other Parts Discussed in Thread: UNIFLASH

I am trying to program a standalone TMS320F28027 IC as per connections shown in the Figure using XDS110 JTAG Debugger.

The test connection using the scan integrity test is successful as shown in the message below.

[Start: Texas Instruments XDS110 USB Debug Probe_0]

Execute the command:

%ccs_base%/common/uscif/dbgjtag -f %boarddatafile% -rv -o -S integrity

[Result]


-----[Print the board config pathname(s)]------------------------------------

C:\Users\HRISHI~1\AppData\Local\TEXASI~1\
CCS\ccs1040\0\0\BrdDat\testBoard.dat

-----[Print the reset-command software log-file]-----------------------------

This utility has selected a 100- or 510-class product.
This utility will load the adapter 'jioxds110.dll'.
The library build date was 'Jun 25 2021'.
The library build time was '11:45:30'.
The library package version is '9.4.0.00129'.
The library component version is '35.35.0.0'.
The controller does not use a programmable FPGA.
The controller has a version number of '5' (0x00000005).
The controller has an insertion length of '0' (0x00000000).
This utility will attempt to reset the controller.
This utility has successfully reset the controller.

-----[Print the reset-command hardware log-file]-----------------------------

The scan-path will be reset by toggling the JTAG TRST signal.
The controller is the XDS110 with USB interface.
The link from controller to target is direct (without cable).
The software is configured for XDS110 features.
The controller cannot monitor the value on the EMU[0] pin.
The controller cannot monitor the value on the EMU[1] pin.
The controller cannot control the timing on output pins.
The controller cannot control the timing on input pins.
The scan-path link-delay has been set to exactly '0' (0x0000).

-----[Perform the Integrity scan-test on the JTAG IR]------------------------

This test will use blocks of 64 32-bit words.
This test will be applied just once.

Do a test using 0xFFFFFFFF.
Scan tests: 1, skipped: 0, failed: 0
Do a test using 0x00000000.
Scan tests: 2, skipped: 0, failed: 0
Do a test using 0xFE03E0E2.
Scan tests: 3, skipped: 0, failed: 0
Do a test using 0x01FC1F1D.
Scan tests: 4, skipped: 0, failed: 0
Do a test using 0x5533CCAA.
Scan tests: 5, skipped: 0, failed: 0
Do a test using 0xAACC3355.
Scan tests: 6, skipped: 0, failed: 0
All of the values were scanned correctly.

The JTAG IR Integrity scan-test has succeeded.

-----[Perform the Integrity scan-test on the JTAG DR]------------------------

This test will use blocks of 64 32-bit words.
This test will be applied just once.

Do a test using 0xFFFFFFFF.
Scan tests: 1, skipped: 0, failed: 0
Do a test using 0x00000000.
Scan tests: 2, skipped: 0, failed: 0
Do a test using 0xFE03E0E2.
Scan tests: 3, skipped: 0, failed: 0
Do a test using 0x01FC1F1D.
Scan tests: 4, skipped: 0, failed: 0
Do a test using 0x5533CCAA.
Scan tests: 5, skipped: 0, failed: 0
Do a test using 0xAACC3355.
Scan tests: 6, skipped: 0, failed: 0
All of the values were scanned correctly.

The JTAG DR Integrity scan-test has succeeded.

[End: Texas Instruments XDS110 USB Debug Probe_0]

However, the following error occurs while uploading the code using CCS as well as UniFLASH:

C28xx: GEL Output:
Device Calibration not complete, check if device is unlocked and recalibrate.C28xx: Flash Programmer: Warning: The configured device (TMS320F28027), does not match the detected device (). Flash Programming operations could be affected. Please consider modifying your target configuration file.
C28xx: GEL Output:
Device Calibration not complete, check if device is unlocked and recalibrate.C28xx: Flash Programmer: Device is locked or not connected. Operation cancelled.
C28xx: File Loader: Memory write failed: Unknown error


We changed the values of all the pull-up resistors to 1k ohm instead of 10k from the above schematic. Still, the issue remains the same. 

Note: The program works perfectly with F28027 Launchpad.

We also connected a pull-up resistor between GPIO34 and 3V3 for verification. Yet, we are unable to program the IC.

For RAM-based program, it shows the following  issue:

C28xx: GEL Output:
Device Calibration not complete, check if device is unlocked and recalibrate.C28xx: Flash Programmer: Warning: The configured device (TMS320F28027), does not match the detected device (). Flash Programming operations could be affected. Please consider modifying your target configuration file.
C28xx: GEL Output:
Device Calibration not complete, check if device is unlocked and recalibrate.C28xx: File Loader: Verification failed: Values at address 0x08286@Program do not match Please verify target memory and memory map.
C28xx: GEL: File: C:\Users\Hrishikesh Mehta\Example_2802xAdcSoc\Debug\Example_2802xAdcSoc.out: a data verification error occurred, file load failed.

Kindly advise.