Lpc2000

> of the FIQ which seems to be about 800nS.
> 
> There is also some jitter on that, so all together I am not sure if 
> the ARM7 is capable of doing what I need in this instance.
> 
> Bit of a shame
> Simon
> 

> 15 byte per microsecond measns 66ns per byte time...


Simon,

This pushes the software solution. A small FPGA would get this done.
I am sure you are calculating the 15 bytes well in advance of the FIQ.

Pre-loading the 15 byte into the memory of the FPGA, arm the FPGA 
logic and wait for the FIQ. The FIQ will also tell the ARM7 that the 
data has been transfered, so the next 15 bytes can be pre-loaded
for the next FIQ.

donhamilton

PS: This is why I love embedded work. Creative solutions to unusal
problems.