TSEC_AVDC_DIR_SIZE
tsec->avdcache.dir_spot = TSEC_AVDC_DIR_SIZE - 1;
iter = (iter - 1) & (TSEC_AVDC_DIR_SIZE - 1);
spot = (tsec->avdcache.dir_spot + 1) & (TSEC_AVDC_DIR_SIZE - 1);
struct avdc_entry dir[TSEC_AVDC_DIR_SIZE]; /* dir entries */