Lpc2000

I'm trying to interface an LPC22xx chip to an external DUART, so I 
can use the board as a communications controller (with 4 serial 
ports). I can't afford to use SPI UARTs on the board for a number of 
reasons.

I'm having _real_ problems finding an external DUART that fits in 
the the external READ cycle of the LPC22xx. I'm fairly new to 
hardware design so am I just reading too much into the bus access 
timings?!?

If anyone out there has successfully used an external UART with the 
LPC22xx I would be really keen to hear from you.