FPGA based 16F84A - lots of rom

[crumgary]

I currently have a VHDL version on the 16F84A working on an fpga. The CCS compiler (PCM v3.242) works fine with it. I was actually pretty impressed.

But, do to the fact that it's on an fpga, I have lots more rom than the actual pic does.

I was wondering how I can tell the compiler about this extra rom.

I've briefly looked at #rom and functions for external eeprom but neither seems to be the proper solution.

--side note, we use hex2vhd to convert the hex code to a vhdl state machine
--I think we got it from http://edaboard.com/ftopic41346.html


Any thought? any other info needed?

Thanks
Gary

[ak6dn]

[treitmey]

I have just been playing around with the typemod directive.
typemod <,multi_read_fram, multi_write_fram,0,131071> fram;

This also may work. But I don't know which is best.


Where can I find info on the FPGA 16F84A?

[crumgary]

treitmey:
here's a link for the vhdl pic core:
http://www02.so-net.ne.jp/~morioka/cqpic.htm

there are a couple others such as the risc16f84 on opencores.org

"typemod <,multi_read_fram, multi_write_fram,0,131071> fram; "
I'll look into those directives.


ak6dn:
I forgot about the device editor. I've seen it back when I was in school (installed in the lab), I just looked on my _brandnew_ install of CCS PCM 3.242 and the device editor is not there.
I also looked at:
http://www.ccsinfo.com/pcwide.shtml

which leads me to believe that it's only available with the pcw version. which is _very_ dissappointing. I believe nasa has lots of pcm's here and convincing them to get the pcw (when we don't need the ide) probabbly isn't going to happen.
They'll just say...... sorry, no pic in space... use a state machine


thanks

[ak6dn]

[crumgary]

ak6dn:

thought would be great if you could use the device editor to change that device.
does that basically just create a new device.dat file?

then I just have to copy my 16f84a.h to a 16f84b.h file and change device to 16f84b inside that header?


I'll pm you with my contact info.

thanks

[kender]