ACK_WIDTH
nsp32_write1(base, ACK_WIDTH, 0);
nsp32_write1(base, ACK_WIDTH, data->cur_target->ackwidth);
nsp32_write1(base, ACK_WIDTH, data->cur_target->ackwidth);
nsp32_read1(base, SYNC_REG), nsp32_read1(base, ACK_WIDTH),
printk("ackwidth=0x%x, ", nsp32_read1(base, ACK_WIDTH));