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Hi All, I have made a pcb based on mcb2300 schematic. For the first time i tried to program the board with Ulink-ME, but not able to program it since its giving j-tag not found error. When i checked on jtag device chain box, U-Link ME device id is not listed there. Whole box is empty.
If i use the ulink-me with MCB2300 board its working fine. No issues.
So i tried to copy the ID CODE, device name, IR length from working MCB2300 setup to my new setup and tried manual configuration. But new error is jtag can not be stopped.
I would like to know what would be the rootcause of this problem. Please reply if you have any work around to solve this.
I just absorbed on MCB2300 board that when i do not power the board by external power and connect J-TAG and open jtag device chain box it is "Empty".
From the schematic of MCB2300 i understand that 3.3v power is required for U-link ME.
But on my new board i am getting 3.3v power correctly.
It's pretty indicative that the core is not powered or connected correctly, and thus not functional. Check for correct part orientation, and pin shorts.
Ensure all supply pins are at the right voltages. The 1.8V pins would be of particular interest.
Are there any 1.8V pins on the 23xx? Isn't it just the 21xx that needs extra hardware for the core voltage?
I found jtag connector on board was reversed. So i just remounted the connector. But now in the jtag device chain its "Jtag communication failure" error.
This is worst than previous one. Voltage level on Ulink-ME pins given below.
0 - 0volt 1 - 3.3Volt
1 1 1 1 0 0 1 1 1 0 1 3 5 7 9 11 13 15 17 19 2 4 6 8 10 12 14 16 18 20 1 0 0 0 0 0 0 0 0 0
Please help me to solve this problem.
Hmm. Interesting. The 21xx chips needed external supply of the core voltages separately from the 3V3 supply for the I/O. But I thought all LPC23xx managed to generate that core voltage using an internal DC/DC from the 3V3 supply pins.
There aren't any 1.8V pins on LPC236x chips, which you can see if you scroll down to the 5th page of that linked schematic which is for 100-pin devices.
The 1.8V pins seems to be unconnected on the Keil schematics.
I have verified the DC-DC voltage pins are powered up 3.3volts. LPC2388 is not on reset state by verifying RSTOUT pin voltage level.
Any idea to resolve this?