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The ssi.baudrate property defines the speed at which the CLK line will be toggled. The term baudrate is a bit of a misnomer because it may lead one to believe that the baudrate in the ssi. object is something stable and precise. In reality, SSI baudrate only crudely defines the clock speed. The baudrate is also device-specific. Here is the formula for T1000-based devices such as the EM1000:

When the PLL is enabled (sys.currentpll= 1- PL_ON) the clock period can be calculated as 0.8us + ssi.baudrate * 0.112us.
With the PLL disabled the period will be 8 times longer.