SL11H_BUFADDRREG
sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
sl811_write(sl811, bank + SL11H_BUFADDRREG, 0);
sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);