I'm selecting the caps for the crystal oscillator of the wiznet W5500. The standard Load Capacitance for 25Mhz crystals is 18pF. I found out that the hardware guideline claims for a Load Capacitance crystal (CL) of 18pF, and taking into accout the formula to select CL0 and CL1, and assuming Stray Capacitance (CS) of 4pF...
CL1 = CL0 = 2 (CL - CS) = 2 (18 - 4) = 28 pF
If you take a low CS of 3pf, it gives 30 pF, and if takes a high value of CS like 5pf, it takes 26pF.
Why, then, in all reference schematics I found (including wiznet schematic reference), CL0 and CL1 are 18pF ???