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RE: 100MHz SDRAM clk



Run boot_linux -F -p from axis/devboard_lx to see if the values you have enterred is really used.
 
PS. Why do you need 100 MHz? The performance will probably not increase (because the internal
bus in ETRAX is 50 MHz anyway) and you will get more problems with EMI etc. DS.
 
/Mikael

-----Original Message-----
From: owner-dev-etrax@xxxxxxx.com]On">mailto:owner-dev-etrax@xxxxxxx.com]On Behalf Of Terje Pedersen
Sent: Tuesday, November 19, 2002 3:00 PM
To: dev-etrax
Subject: 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