ARM IM-AD1 - Manual (Page 61)

Reference Design Example
ARM DUI 0163B Copyright © 2001-2003. All rights reserved. 4-15
4.5 Synchronous serial port
The synchronous serial port PrimeCell is used to implement the SPI interface. Refer to
the ARM PrimeCell Synchronous Serial Port Master and Slave (PL022) Technical
Reference Manual for information about this device.
The SSP is clocked by the CLK1 signal from the logic module. This clock is set to
25MHz by default.