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About P4080RM

Question asked by zhou jizhao on Mar 6, 2019
Latest reply on Mar 15, 2019 by Bulat Karymov

I have a P4080DS board ,we have two questions about DDR Memory Controller register:


1. about 11.4.9 DDR SDRAM control configuration 2
(DDRx_DDR_SDRAM_CFG_2 )


in this regiser bit24-25 is reserved ,but when I set bit 24 -25 as 00,it doesn't work;when

I set bit 24-25 as 01 ,it work well.can you tell me why?

2.about  11.4.10 DDR SDRAM mode configuration
(DDRx_DDR_SDRAM_MODE)  and 11.4.11 DDR SDRAM mode configuration 2
(DDRx_DDR_SDRAM_MODE_2)

these two registers are very important for different DDR rate,but I don't know how to config them in different DDR rate, the P4080RM didn't give us a detail explain ,Please give us more detail information about these two registers.Thank u very much!!


 

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