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am335x gpmc timing

hello,I need to slow the gpmc timing to communicate to fpga. This is my config:

out32(GPMC_CONFIG1_0, 0x00000000);
out32(GPMC_CONFIG2_0, 0x001E1F00);
out32(GPMC_CONFIG3_0, 0x001F1F00);
out32(GPMC_CONFIG4_0, 0x1F03FF31);
out32(GPMC_CONFIG5_0, 0x001C1F1F);
out32(GPMC_CONFIG6_0, 0x8F070080);
out32(GPMC_CONFIG7_0, 0x00000F54);

Now the total cycle is 300ns, I want to slow it to 600ns. How can I do? thanks