I am confused on which crystal to use. The AT91SAM7S128 can go a max of 55MHz, and for my app, higher the better. However, the manual is confusing me about what I'm limited to using for the USB:
"Communication through the USB Device Port is limited to an 18.432 MHz crystal."
on page 146:
"A 48 MHz USB clock is necessary to use the USB Device port. It has been programmed ear-
lier in the device initialization procedure with PLLB configuration."
"The USB Source Clock is the PLL output. If using the USB, the user must program the PLL to
generate a 48 MHz, a 96 MHz or a 192 MHz signal with an accuracy of Â± 0.25% depending on
the USBDIV bit in CKGR_PLLR."