Try the FTDI FT2232D device. It has two ports besides the USB which can 
be either a uart or spi.

Harold Hallikainen wrote:
> Does anyone know of an SPI based usb chip? Most (FTDI, SiLabs, etc.) have
> a UART interface on the PIC side. If I had SPI, I could free up the PIC
> UART for other stuff and rely upon the USB chip buffer instead of
> duplicating it in the PIC. So far, I'm looking at the FT245R, which has a
> parallel interface. SPI would save some pins...
> 
> THANKS!
> 
> Harold
> 
> 


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