taglinefilesource code
fc415drivers/sound/gus_wave.cunsigned short  fc;
fc417drivers/sound/gus_wave.cfc = (unsigned short) (((freq << 9) + (divisor >> 1)) / divisor);
fc418drivers/sound/gus_wave.cfc = fc << 1;
fc420drivers/sound/gus_wave.cgus_write16 (0x01, fc);
fc49include/linux/if_tr.hunsigned char   fc;  /* frame control field */
fc49net/802/tr.ctrh->fc=LLC_FRAME;