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Fw: 100MHz SDRAM clk



Needed configuration:
1 Early wait
2 Late wait
Extended Write Cycle
Bus width = 16bit
SDRAM clk = 100MHz
 
Hardware:
sdram clk on pin /ras2 (A3)
Ram selected with /csr0 (D7)
Using the Etrax MCM
 
My current configuration is:
R_WAITSTATES = 90f8
R_BUS_CONFIG= 124
R_SDRAM_CONFIG = d27a7878
R_SDRAM_TIMING = 80005801
 
 
After configuring with the above values I still haven't got 100MHz out on the pin but just 50MHz.
What do I need to do to get 100MHz?
 
 
Terje Pedersen
Jakob Hatteland Computer