07-21-2013, 07:09 AM
(This post was last modified: 07-21-2013, 07:10 AM by CMOSprinkles.)
Evil, I would love to see a link to an 'awesome' 3 tick 2 wide instant carry adder. I don't think it has been done, especially since the instant carry system takes 2 ticks to reset on the falling edge, which makes them only able to be clocked at 2 ticks slower than the time to calculate the sum or carry. For example, if a regular piston based instant carry adder takes 4 ticks to calculate sum or carry (two 2 tick XOR's for sum and a 2 tick AND plus a 2 tick XOR for carry), it takes two more ticks to change states from carry to sum due to the piston taking two ticks to block the carry. So, it can only be clocked at 6 ticks.
tl;dr: Are you sure those '3 tick instant carry adders' aren't actually 5 ticks?
tl;dr: Are you sure those '3 tick instant carry adders' aren't actually 5 ticks?