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Replace my 256M (4M x 4 Banks x 16 bit) SDRAM Memory to 512M (8M x 4 Banks x 16 bit)

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diggdip

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Hi

I'm trying to replace my 256M (4M x 4 Banks x 16 bit) SDRAM Memory to 512M (8M x 4 Banks x 16 bit) SDRAM Memory (pin compatible).

I have 32 bit CPU (SDRAM interface runs at 133 MHz clock frequency) using higher and lower addresses bits, for 2 of such devices:
1. I think i can do it without any problems am i correct? What could be the limitations?
2. I also had problem to find the exact clock frequency devices. would a 143 MHz SDRAM work for such configuration? What could be the limitations?

Thanks!
 

Re: Can I use SDRAM 133Mhz with clock 100Mhz or belower?

256M and 512M SDRAM have different page sizes. Software changes might be required to handle it.
 
Wouldn't it be considered as overclocking, won't it affect system stability?
 

I suppose you're right it is under-clocking.
So if i understand the issue correct if i'll use the 144 MHz rated SDRAM with 133 MHz SDRAM controller clock frequency,
the system simply will operate in 133 MHz clock frequency?
 

The RAM doesn't have a clock generator on board it works with the clock that the system feeds , if that is 133MHz then the RAM will work @133MHz
 
How about using DDR or DDR2 instead of older SDRAM how would matter?
 

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