TUL_XCmd
if (inb(host->addr + TUL_XCmd) & 0x20) {
outb(TAX_X_ABT, host->addr + TUL_XCmd);
outb(TAX_SG_IN, host->addr + TUL_XCmd);
outb(TAX_X_IN, host->addr + TUL_XCmd);
outb(TAX_SG_OUT, host->addr + TUL_XCmd);
outb(TAX_X_OUT, host->addr + TUL_XCmd);
outb(TAX_X_ABT | TAX_X_CLR_FIFO, host->addr + TUL_XCmd);
outb(TAX_X_ABT | TAX_X_CLR_FIFO, host->addr + TUL_XCmd);