| commit | 400a66a1163c9eb489abb30668f4945c3141d638 | |
| author | Jeff Connelly <shellreef+git@gmail.com> | |
| Mon, 26 May 2008 04:53:33 +0000 (25 21:53 -0700) | ||
| committer | Jeff Connelly <shellreef+git@gmail.com> | |
| Mon, 26 May 2008 04:53:33 +0000 (25 21:53 -0700) | ||
| tree | b988d3f243a75768f10727a61075f283e0122f7f | treesnapshot (tar.gz zip) |
| parent | c4aa324cee61199573caa740bf2e3db211f7a2b3 | commitdiff |
Fix the ALU and properly test it (including difference, not just sign output).
The ripple-carry adder was wired incorrectly, in reverse. Fix
the ordering. Also, the carry-out clearly shouldn't be inverted--
as far as the ripple carry adder is concerned, all it does is
addition; the subtraction is handled by inverting the inputs.
Updated timing diagram at http://jeff.tk/wiki/Image:ALU_Timing_Diagram.png .
The ripple-carry adder was wired incorrectly, in reverse. Fix
the ordering. Also, the carry-out clearly shouldn't be inverted--
as far as the ripple carry adder is concerned, all it does is
addition; the subtraction is handled by inverting the inputs.
Updated timing diagram at http://jeff.tk/wiki/Image:ALU_Timing_Diagram.png .
| circuits/alu.asc | diffblobblamehistory | |
| circuits/alu.asy | diffblobblamehistory | |
| circuits/alu_test.asc | diffblobblamehistory | |
| circuits/alu_test.plt | diffblobblamehistory |