[Coco] 6809 FPGA

[Bill Nobel]

> Well I know the AS6C4008-55PCN will work because I've got it running on two different FPGA projects right now.  Maximum speed that I can run the CPU core is 16.67 MHz with those.  But, when I used the internal memory I could go the full 25 MHz no problem.  While you're waiting on the Mouser shipment you should give the internal memory a try even if you only try 4K at first.  Grant's code enables it with this:
> 
> internalRam1DataOut when n_internalRam1CS= '0' else
> 
> and:
> 
> internalRam1DataOut when n_internalRam1CS= '0' else
> 
> Just comment out these:
> 
> sramData when n_externalRamCS= '0' else
> 
> and:
> 
> n_externalRamCS <= '0' when cpuAddress(15 downto 13) = "001" or cpuAddress(15 downto 13) = "010" or cpuAddress(15 downto 13) = "011" or cpuAddress(15 downto 13) = "100" else '1';
> 

Are you serious,  I did’t think I could use any of the internal ram Grant said in his post.  I thought that was unique to the ep2c5t144c8n he was using (learned more again)

Bill Nobel