[En-Nut-Discussion] Wait states in avr_nutinit.c

[Henrik Maier]

Ole,

thanks for the clarification. I then will make it consistent for the 
ATC90CAN128 part so that macro NUT_3WAITSTATES configures 0 waits for 
the lower area (I also think one wouldn't need it...) and 3 for the 
upper area.

Henrik

FOCUS Software Engineering Pty Ltd
Brisbane, Australia - Web: www.focus-sw.com
Phone: +61-402 970 933 - Fax: +61-7-3009 0399



Ole Reinhardt wrote:
> Hi,
> 
>> These two lines:
>>
>> outb (XMCRA, 0x42);
>> outb (XMCRB, 0x00);
>>
>> configure two memory sectors and 3 wait states for the upper range
>> (SRW10 and SRW11) but zero for the lower range (SRW00 = 0).
>> Is this intended? Or should these two lines rather be:
> 
> 
> I added these two lines as I need them for my own board. It's a 
> ATMega128 Board with 32K of external RAM at the lower 32K of the address 
> range. The upper 32K are occupied by an SJA1000 CAN controller and a 
> cs8900 ethernet controller. The cs8900 has problems if I don't enable 
> the three waitstates for the upper memory range. As you only can set the 
> waitstates for two sections independently this is the correct setting 
> for my board (M-CAN architecture). The lower range works fine without 
> any waitstate for me. Do we need any for 70ns SRAM?
> 
> Bye,
> 
> Ole
>