Ok, here's some clues.
Mode 3:
:00000000001100011011110111111000000000011000011010000111110
000000001110001111010111111110000011111000001111010111111110
000110000000011100010111111100001100000001111101110111111100
001000011111111001000111100000001000111111100011011111100000
011001111000001110011111100000010001110011111000111111100011
110001100110000011111111100010000011101100111111111110000010
000011101001111111111110000010011111001011111111111100000010
0111110110111111111100000011100110000100111111
[465 465]
The tia manual says "5 bit poly --> 4 bit poly"
note that 465 == 31*15
There's probably some way to chain the two 4 and 5 bit polynomials
together to get that same bit pattern. Suggestions are welcome.
Mode 15:
:11111111110000011100000001111000000000011111100011111100001
1111111100000011111000000111100000
[68 68 67 66 65 63 62 37 36 35 34 32 31 6 5 4 3 1]
note the pattern in the coefficients:
(0 is always assumed to be a coefficient)
0+31=31 31+31=62
1+31=32 32+31=63
3+31=34 34+31=65
4+31=35 35+31=66
5+31=36 36+31=67
6+31=37 37+31=68
Again, suggestions on how to simplify this are welcome.
Taking a step back and looking at it, I'm probably the only one who
understands this. Probably my responsibility to turn it all into C code
then. hehehe.
I could live with the 68 bit pattern in an FPGA implementation, but
the 465 bit pattern seems like a bit much. There's gotta be a way to
simplify that one. Suggestions?
--
adam@xxxxxxxxxxxxxxxx http://cuddlepuddle.org/~adam/pgp.html
Will code for food. http://cuddlepuddle.org/~adam/resume.html
"The dinosaurs are not around today because they did not have a space program."
-- Arthur C. Clarke
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