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Debugging problem on a LPC2103 with uLink

Hello. I've a problem with LPC2103.
I've two boards. The first-one is a Silica Demo Board with a Philips (with Philips logo) LPC2103. The second one is a home built board with only a NXP (note not Philps marked!) LPC2103 and just supplies and xtal.

I've a Keil uLink and I use uVision3 for Arm.
So, I can program both MCUs and everything works well.
Unfortunately I can debug just only the Silica demo boards, on my home built board doesn't work. If I put the MCU in run mode the program doesn't go; if I put a breakpoint the program doesn't stop. With Silica board I can do all of these operations.

I checked the layout and all board connections are correct respect to the schematic of jtag connector of uLink (got on Keil web site).

I sniffed all JTAG net and I didn't see any suspectous
signal. No noise.

I pushed the power supply of core to 2.0V on my board like Silica board after reading an errata from NXP regarding a bonding dropout voltage....nothing appened.

May be a problem because I'm using an NXP marked MCU instead of a Phlips marked MCU? I didn't find any note regarding mask errata or similiar (silicon problem).

Can anyone help me?

Best Regards

Stefano

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