Catch up on stories from the past week (and beyond) at the Slashdot story archive

 



Forgot your password?
typodupeerror
×

Comment Kickstarter Goals? (Score 3, Interesting) 98

Reading TFA is seems by 'Kickstarter Goal' they mean getting funded.
Once you've got funded you have to actually do the thing you said you were going to do with the money.

If people are using gender to determine who they are funding, they are presumably displacing more rational metrics, like "does the project make any sense?", or "Does this person seem competent to do what they claim they can do?'.

Thus in those areas where gender bias is measurable in funding, I would assume the odds of eventual successful delivery to be reduced.

Comment Re:As a chrono-American, I can remember... (Score 3, Informative) 112

America is closer to a penal colony these days.

From the internetz: http://en.wikipedia.org/wiki/U...

The incarceration rate in the United States of America is the highest in the world. As of October 2013, the incarceration rate was 716 per 100,000 of the national population.[2] While the United States represents about 5 percent of the world's population, it houses around 25 percent of the world's prisoners.[3][4] Imprisonment of America's 2.3 million prisoners, costing $24,000 per inmate per year, and $5.1 billion in new prison construction, consumes $60.3 billion in budget expenditures.

Comment Re:This seems like a good time to meniton these (Score 1) 168

Every D-flip flop is an async circuit. W.

How's that then? Would you care to explain, please, what you mean?
My D-FFs here are totally synchronous: The D-input pops up at the output exactly with the rising clock edge + processing delay. And the latter is unavoidably indefinably. .

A DFF is the basic element of a synchronous circuit, yes. But look inside a DFF and it's a basic async circuit with two (or 3 or 4) inputs and one (or two) outputs. That's why it requires you to maintain at least a minimum time gap between certain transitions on the inputs.

Don't they teach async design at college these days?

Comment Re:This seems like a good time to meniton these (Score 2) 168

I do understand it. That patent describes an asynchronous data transfer with rendezvous using a conventional quadrature handshake. I can't imagine that there isn't prior art. That is standard stuff. The date of the patent is 2006. I finished my degree in 1991 around the same time the amulet async ARM was beginning development. My tutor at college invented the async register file for the amulet.

The method it describes is slow because it requires a two round trips between source and destination. That is why clock-in-data schemes are preferred. The neatest of those is the DS link code that was put out by Inmos in the early 90s (I used to work there). A receiving async circuit can recover data and clock and pass it on to a synchronous receiver using normal methods.

But it makes the same wrong assumption that the 'better than clock gating' efficiencies of async logic would be superior to a synchronous circuit. However these days it doesn't matter. In small geometries, your logic is sucking power whether or not it is clocked, due to static leakage. The way of the world these days is fine grained power gating. As per my previous post, async transactions have a role to play in power gating (because you don't need to leave the clock tree on to use them), but they are a false economy in random logic applications because the increased gate count leads to an increased static current draw.
   

Comment Re:This seems like a good time to meniton these (Score 1) 168

It depends.

Yes. In semiconductors, there's a basic tradeoff between static power dissipation and propagation latency. In a slow/low static current process, you might well be able to use asynchronous design to improve power efficiency. This is more the realm of RFID tags, payment cards and smart card chips. You won't be finding much of that going on in a desktop or phone CPU.

Slashdot Top Deals

This file will self-destruct in five minutes.

Working...