2008-02-03 22:31:31 a question about CLKOUT of BF531 using u-boot-1.1.6
jinhua zhou (CHINA)
I have some problems about the BF531--silicon ver 0.5.
I modify u-boot-1.1.6 include/configs/bf533-ezkit.h file:
1: CLKIN = 25MHz
2: BFIN_BOOT_MODE = BF533_SPI_BOOT, using AT45DB161D SPI flash
3: BFIN_CPU = ADSP_BF531.
4: CONFIG_VCO_MULT = 16, CONFIG_CLKIN_HALF = 0, CONFIG_PLL_BYPASS = 0.
5: CONFIG_CCLK_DIV = 2, CONFIG_SCLK_DIV = 4.
6: CONFIG_MEM_SIZE = 16MB using MT48LC8M16A2TG
7: I use ADM811 to generate stable RESET Low pulse for BF531.
i get 100MHz clock from the pin CLKOUT after power up.
However, I found the SDRAM control signals(/CS,/CAS,/RAS,/WE)changed on the rising edge of CLKOUT,but not on the falling edge.This is conflicting with SDRAM timing and BF531/532/533 datasheet, so my SDRAM doesn't work properly.
Could you please give me some comments or suggestions about my problems?
Thank you so much.
Look forward to see you reply.