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JTAG connection problems with LPC1317

I've got a simple board design with an LPC1317. For programming this device I'm using uVision 4.60 and a ULINK Pro going through the 10 pin Cortex header. I cannot get the cable to connect to this device -- uVision reports "No Cortex-M Device found in JTAG Chain".

Under the cable settings I see JTAG Device Chain: IDCODE=0x1ACCC02B Name="Unknown JTAG Device" IRlen=5.

ULINK Pro Cable Settings:
1) SWJ box checked.
2) Max Clock slowed down to 100kHz
3) Port: JTAG
4) Connect: under RESET

I've verified the following on my board:

1) Power and ground pins are correct, proper bypass/decouping caps are used.
2) TDI, TDO, TMS, TCK, and RESET_N are wired up correctly to the 10 pin header.
3) Proper pullup/pulldown resistors used on TDI, TDO, TMS, TCK, RESET_N lines.
4) TRST_N pin is floating (using internal pullup?)

The same cable/software setup works fine when connected to an MCB1700 dev board, although this is based on an LPC1768.

I'm stuck bringing this board up. Any suggestions are appreciated! Thanks!

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