Lpc2000

We are interfacing to a peripheral usb chip and have come up with a
limitation that I'm having difficulty overcoming so I thought I'd post
this to the group to see if anyone has any suggestions.
 
Basically, when a READY pin goes high, the usb chip requires us to
initiate the followon write (by driving a WRITE pin low) within 360
nanoseconds.  Even writing in assembler, about the best I can
consistently do (detecting READY high and driving WRITE low) is 500+ns.
If anyone can suggest a trick to speed this up I'd appreciate their
input.  (BTW, we are running the CPU at 59+Mhz and vpb divider is 2)
 
Curt