Which end of the adder is the LSB? (endian!)

[David Rysdam]

The implementation note just says "from right to left" but which end is the right? Is it in/out[0] or in/out[15]?

[milythael]

Typically, the least significant bit of a number matches how we use
decimal numbers in general.  Left is most significant and right is
least significant.  If I recall, the bits of a bus are labeled as
such: 9876543210 for a 10 bit bus.

On Sat, Oct 29, 2011 at 2:19 PM, David Rysdam [via TECS Questions and
Answers Forum] <[hidden email]> wrote:
> The implementation note just says "from right to left" but which end is the
> right? Is it in/out[0] or in/out[15]?

[David Rysdam]

I guess I'll just try it both ways and see which passes.

[cadet1620]

David Rysdam wrote

The implementation note just says "from right to left" but which end is the right? Is it in/out[0] or in/out[15]?

Bits on buses are numbered such that bit n is the 2ⁿ bit of numbers; bit 0 is the LSB.

--Mark

[David Rysdam]

Yay, right on the first try. Bit 0 is the LSB, i.e. doesn't need a carry in from bit 1.