PUTCB16
PUTCB16(cb, CB_TX_COUNT_OFFSET, (sz & 0x3fff) | CB_TX_EOF);
PUTCB16(ncb, CB_STS_OFFSET, 0);
PUTCB16(ncb, CB_CMD_OFFSET, cmd);
PUTCB16(lcb, CB_CMD_OFFSET, GETCB16(lcb, CB_CMD_OFFSET) & ~CB_CMD_S);
PUTCB16(cb, CB_MCS_CNT_OFFSET, i);