TI_WINBASE
CSR_WRITE_4(sc, TI_WINBASE, TI_TX_RING_BASE);
CSR_WRITE_4(sc, TI_WINBASE, (segptr & ~(TI_WINLEN - 1)));
CSR_WRITE_4(sc, TI_WINBASE, (segptr & ~(TI_WINLEN - 1)));
CSR_WRITE_4(sc, TI_WINBASE, (segptr & ~(TI_WINLEN - 1)));