AM335X GPMC Timing diagram is very stange

the configuration is as followed:

and I changed the timing many times, the gpmc timing is still as the picture above!!

static struct gpmc_timings fpga_timings =
{
.sync_clk = 0,

.cs_on = 0,
.cs_rd_off = 80,
.cs_wr_off = 80,

.we_on = 40,
.we_off =58,

.oe_on = 40,
.oe_off = 60,
.access = 70,
.rd_cycle = 81,
.wr_cycle = 81,
};

gpmc_cs_write_reg(GPMC_CS, GPMC_CS_CONFIG1, GPMC_CONFIG1_READTYPE_ASYNC |
GPMC_CONFIG1_WRITETYPE_ASYNC |
GPMC_CONFIG1_DEVICESIZE_16 |
GPMC_CONFIG1_DEVICETYPE_NOR |
GPMC_CONFIG1_FCLK_DIV3);

val = gpmc_cs_read_reg(GPMC_CS, GPMC_CS_CONFIG1);
val &= NONE_MUXADDATA;
gpmc_cs_write_reg(GPMC_CS, GPMC_CS_CONFIG1, val);