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Correct sdram setting for 32MByte SDRAM

Question asked by pfeifferc on Sep 9, 2011
Latest reply on Mar 27, 2012 by Andreas

Hi !

I substitute my hardware with a newer SDRAM

K4S561632J-UI75

so i've adapted EBUI registers but i'm not sure if these settings correct.

i use the ebiu_calc.htm received years ago from AD but if i calc my settings per hand they not

corresponding.

 

So using a BF537 DSP with 125MHz sysclock i use following values from datasheet

Bank specific Values

ext.bank size= 32MB

Column AddrWith = 9 bits

Minimum TRAS = 45ns

Minimum TRP = 20ns

Minimum TWR = 2cycles ???

refresh period 8192rows in 64ms

CAS latency at reset : 2cycles ??

 

so what are the correct values for EBIU_SDRRC / EBIU_SDBCTL / EBIU_SDGCTL

and what could happen if RRC reg is to big ???

is there a never version for the ebui_calc.htm available ?

 

best regards christoph

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