Hi,
In order to understand how to configure SDRAM_TIM_1, SDRAM_TIM2 and SDRAM_TIM3, I've compared the values given by the DDR Calculation tool with the values defined in the U-boot of the TI AM3359 EVM board.
Some values are the same, some others are fast the same and some others are totally differents.
Some values are the same, some others are fast the same and some others are totally differents.
Which values are the right ones ? Is there some margin to consider on timings ?
And finally how do I have to define register value for the model of DDR2 that I will use in my design and that is not exactlly the same as on EVM board ?
And finally how do I have to define register value for the model of DDR2 that I will use in my design and that is not exactlly the same as on EVM board ?
Parameters that are not the same in calculator than on EVM board are :
name calculator EVM
reg_t_ras 10 11
reg_t_rc 14 15
reg_t_rrd 1 2
reg_t_wtr 1 6
reg_t_rc 14 15
reg_t_rrd 1 2
reg_t_wtr 1 6
reg_t_xsnr 54 59
reg_t_rtp 1 3
reg_t_rfc 51 52
reg_t_ras_max 15 7
reg_t_rtp 1 3
reg_t_rfc 51 52
reg_t_ras_max 15 7
Thanks
Cyril
Cyril