<rqou>
is it just me or does the layout of McCarran International Airport _suck_?
<sorear>
impressive, telling chrome to zoom in on a google docs drawing makes the drawing *smaller*
<awygle>
wow
<awygle>
mithro: i don't think you actually get to ignore that middle input in that case
<mithro>
awygle: Well, that is kind of what I'm asking I guess
<awygle>
in fact the way you've drawn it you actually pass the blue signal through, because the purple signals cancel out. unless i'm completely misunderstanding.
<mithro>
sorear suggested Figure C2
<sorear>
ok, I was a little bit confused earlier, I thought "carry enable" referred to the in3 selector mux
<mithro>
The carry calculates In2+In1+cin > 1, right?
<mithro>
I believe Figure A2 is how you would use the LC cell as an adder?
<sorear>
anywhere that you're feeding constant 0,1 for in1,in2 that's a no-op and can/should be elided?
<awygle>
oh wait, "carry >1"
<awygle>
is that really the function? a strict greater than?
<awygle>
if so, then yes, you can do what you're describing.
<awygle>
that block on _actual_ lattice docs is always just drawn as a trapezoid with no further explanation, i kind of assumed it was a 3-bit XOR or something
<sorear>
oh, "fcin" in the diagram refers to the special bottom-of-CLB mux that allows adjacent CLBs to either cascade or be independent
<sorear>
i'm fairly certain it's a 3-input majority gate
<azonenberg_work>
rqou: the layout is intended to funnel you past as many slot machines as possible :p
<rqou>
azonenberg_work: seems like it :P
<rqou>
this is actually my first time ever landing there as i normally drive to Vegas
<awygle>
denver still worst airport imo. or washington dulles
<rqou>
I've heard Seoul is pretty bad but I've never been there
<mithro>
awygle / sorear: I want to write this stuff down with diagrams I can understand as I'll forget it all next week :-P
<mithro>
awygle / sorear: I don't think it makes sense to ever use the carry without the LUT?
<sorear>
if you only need the carry-out or MSB of an addition (e.g. if you're actually implementing a comparator), you don't need to populate the lower-order LUTs, not that it would hurt
* prpplague
looks in at the discussion
<prpplague>
<awygle> denver still worst airport imo. or washington dulles
<prpplague>
awygle: no, no, no, try charles de gaulle airport
<prpplague>
awygle: i've flown into third world country airports before and de gaulle is still top of my list of the worst airport on the face of the planet
<awygle>
I should have specified us airports
<zkms>
CDG is weirdly hellish
<zkms>
KDEN is actually not that bad (besides the creepy horse statue, that is legitimately hellish) but then again i used to live around Denver so i am severely biased
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<rqou>
so azonenberg_work, going to miss partying with your cow-orkers? :P :P :P
<azonenberg_work>
nope
<azonenberg_work>
dont miss it at all :p
<rqou>
lol
<rqou>
can you ping monochroma and ask if they will be here?
<azonenberg_work>
Given that she was here yesterday and said nothing about it
<azonenberg_work>
i'm assuming no
<rqou>
ok
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<whitequark>
prpplague: try VKO
<whitequark>
at least in CDG you don't have to be stuck overnight with an entire platoon of soldiers and no air conditioning
<whitequark>
Ask Me How I Know
<rqou>
whitequark how do you always have the most "unique" airport experiences?
<whitequark>
and you've only heard the ones i publicly describe, too :p
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<pie_>
unrelated, azonenberg_work, dumb question; would there be any security advantage to implementing hardware security modules on something generic like fpgas (so stuff could get routed differently etc, so you couldnt actually target a specific internal component), say to protect against supply chain attacks?
<pie_>
or would disadvantages outweigh whatever benefits im presuming? like not having whatever security features stuff like this usually has for a chip
<azonenberg_work>
i know at least bloomberg has an FPGA-based HSM but its not ofr supply chain reasons
<azonenberg_work>
they just wanted custom features
<azonenberg_work>
they made a pretty standard virtex6 + PCIe board then wrapped in the 3M antitamper mesh that ibm uses in their HSMs