General Form (the PHASE parameters are only possible when XSPICE is enabled):

SFFM(VO VA FC MDI FS PHASEC PHASES)

Examples:

V1 12 0 SFFM(0 1M 20K 5 1K)

The shape of the waveform is described by the following equation:

[\begin{array}{ll} {V\left( t \right) = V_{O} + V_{A}\sin\left( {2\pi \cdot FC \cdot t + MDI\sin\left( {2\pi \cdot FS \cdot t + PHASES} \right) + PHASEC} \right)} & \ \end{array}]