Hello,
I'm having trouble figuring out what value to put in for T_RASMAX in the AM1808 SDTIMR2 register.
The equation (spruh82a.pdf, p. 364) asks for tRAS over refresh rate. tRAS is listed in my sdram datasheet (45ns) but I'm not sure what to use for "refresh rate". I thought the ram refresh rate was variable based on the ram controller's state machine, but not to exceed certain limitations. I have a max refresh period, tREF of 64ms or a average periodic refresh tREFI of 7.8us, both listed in my datasheet, but none can be divided to come up with anything that's an 8 bit integer.
The ram we are using is IS46LR16160G-6BLA2-TR
Is there any additional information that anyone has regarding how to select the value for this register?
Thank you,
Marshall Taylor