NAND Gates Rule!

[John Larkin]

On Mon, 2 May 2011 20:26:48 -0700 (PDT), George Herold
<gherold@teachspin.com> wrote:

On May 2, 9:45 pm, Globemaker <alanfolms...@cabanova.com> wrote:
Facts from basic electronics : boolean logic:
With a million NAND gates I can make a computer.
With a million XOR exclusive OR gates, nobody can build one NAND
gate.

NOR?

With a million popsicle sticks, I can make a helicopter!

John

 

[Rich Grise]

BBC wrote:

On May 3, 6:45 am, Globemaker <alanfolms...@cabanova.com> wrote:
Facts from basic electronics : boolean logic:
With a million NAND gates I can make a computer.
With a million XOR exclusive OR gates, nobody can build one NAND
gate.

It is becoz NAND gates are termed as universal gates,but can i get the
answer Why NAND gates can't be produced with XOR?

Go to the "Boolean algebra" section of your textbook, or ask the teacher.

Good Luck!
Rich

 

[Rich Grise]

BBC wrote:

Can u plz tel me Why the NOR gates consumes more power than the NAND
gates,even though both are UNIVERSAL GATES?

Nly f u cn lrn 2 spk Nglsh.

Hope This Helps!
Rich

 

[Nobody]

On Wed, 04 May 2011 17:19:00 -0700, BBC wrote:

Facts from basic electronics : boolean logic:
With a million NAND gates I can make a computer.
With a million XOR exclusive OR gates, nobody can build one NAND
gate.

It is becoz NAND gates are termed as universal gates,but can i get the
answer Why NAND gates can't be produced with XOR?

You're looking at it the wrong way. NAND and NOR happen to be universal;
most of the others aren't (of the 16 binary gates, 6 are universal, the
other 10 aren't).

The 6 that are universal all have the behaviour that one input is either
ignored or inverted depending upon the other input. The differences are
which input is which, and whether the "ignored" state results in a 0 or 1.
These 6 gates are:

!(A+B) !(A.B)
A.!B !A.B !A.!B A+!B !A+B !A+!B
00 01 10 10 11 11
10 00 00 11 01 10

 

[Tom Del Rosso]

George Herold wrote:

On May 2, 9:45 pm, Globemaker <alanfolms...@cabanova.com> wrote:
Facts from basic electronics : boolean logic:
With a million NAND gates I can make a computer.
With a million XOR exclusive OR gates, nobody can build one NAND
gate.

NOR?

The computers on each of the Apollo modules and the upper stage of the
Saturn V were made from dual NOR gate packages.


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[krw@att.bizzzzzzzzzzzz]

On Thu, 5 May 2011 18:05:52 -0400, "Tom Del Rosso" <td_03@verizon.net.invalid>
wrote:

George Herold wrote:
On May 2, 9:45 pm, Globemaker <alanfolms...@cabanova.com> wrote:
Facts from basic electronics : boolean logic:
With a million NAND gates I can make a computer.
With a million XOR exclusive OR gates, nobody can build one NAND
gate.

NOR?

The computers on each of the Apollo modules and the upper stage of the
Saturn V were made from dual NOR gate packages.

NOR is the natural gate for ECL, as NAND is for TTL.

 

[Michael A. Terrell]

Tom Del Rosso wrote:

George Herold wrote:
On May 2, 9:45 pm, Globemaker <alanfolms...@cabanova.com> wrote:
Facts from basic electronics : boolean logic:
With a million NAND gates I can make a computer.
With a million XOR exclusive OR gates, nobody can build one NAND
gate.

NOR?

The computers on each of the Apollo modules and the upper stage of the
Saturn V were made from dual NOR gate packages.

Flatpack 914 or 923 RTL?

--
You can't fix stupid. You can't even put a Band-Aid™ on it, because it's
Teflon coated.

 

[Tom Del Rosso]

Michael A. Terrell wrote:

Tom Del Rosso wrote:
The computers on each of the Apollo modules and the upper stage of
the Saturn V were made from dual NOR gate packages.


Flatpack 914 or 923 RTL?

I see a close-up of the die with wirebonds, but not of the package. The
wires go to opposite sides, like in a DIP.

So, was the 923 always in a round package?


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[krw@att.bizzzzzzzzzzzz]

On Thu, 5 May 2011 20:12:23 -0400, "Tom Del Rosso" <td_03@verizon.net.invalid>
wrote:

Michael A. Terrell wrote:
Tom Del Rosso wrote:
The computers on each of the Apollo modules and the upper stage of
the Saturn V were made from dual NOR gate packages.


Flatpack 914 or 923 RTL?

I see a close-up of the die with wirebonds, but not of the package. The
wires go to opposite sides, like in a DIP.

So, was the 923 always in a round package?

The Saturn V IUS computer was an IBM design. SLT (DTL), IIRC.

 

[Michael A. Terrell]

Tom Del Rosso wrote:

Michael A. Terrell wrote:
Tom Del Rosso wrote:
The computers on each of the Apollo modules and the upper stage of
the Saturn V were made from dual NOR gate packages.


Flatpack 914 or 923 RTL?

I see a close-up of the die with wirebonds, but not of the package. The
wires go to opposite sides, like in a DIP.

So, was the 923 always in a round package?

The ones I have are flatpack, bought surplus from poly-Paks and
marked NASA.

--
You can't fix stupid. You can't even put a Band-Aid™ on it, because it's
Teflon coated.

 

[Rich Grise]

Tom Del Rosso wrote:

George Herold wrote:
On May 2, 9:45 pm, Globemaker <alanfolms...@cabanova.com> wrote:
Facts from basic electronics : boolean logic:
With a million NAND gates I can make a computer.
With a million XOR exclusive OR gates, nobody can build one NAND
gate.

NOR?

The computers on each of the Apollo modules and the upper stage of the
Saturn V were made from dual NOR gate packages.

The Control Data/Bendix G15, the one they had at my high school ca. 1965,

had tubes.
http://members.iinet.net.au/%7Edgreen/docs.html

Cheers!
Rich

 

[Globemaker]

Can u plz tel me Why the NOR gates consumes more power than the NAND
gates,even though both are UNIVERSAL GATES?

i already explained: the mobility of holes is less the the mobility of
electrons.

NOR USB Flash
drives would have used more power wastefully because hole mobility is
less than electron mobility.
The CMOS circuits use NMOS NAND structures because electron mobility
in silicon is 1200 cm^2 per (volt*second). Hole mobility is 3 times
lower! If NOR memory arrays had been used for USB Flash drives, the
PMOS stack in the NOR array would be 3 times as large, with 3 times
the capacitance. Power of capacitive loads is 1/2fCV^2 where f is the
frequency of switching on and off a memory cell. C is the capacitance
of the PMOS drain/source capacitance plus parasitics. V is about 1.2
volts for modern silicon chips.
The power of NOR is not the same as the power of NAND. But the logic
has the same capabilities. With one million NOR gates , I could build
a computer.

nor has a stack of pmos in series : uses more power.
nand has nmos in series, so lower power.

 

[Globemaker]

Why NAND gates can't be produced with XOR?

xor has the symmetrical truth table.
nand has asymmetrical truth table

so no amount of symmetrical logic of xor can give unbalanced logic.
try it out in schematics yourself, it is TRUE!

xor
00 0
01 1
10 1
11 0

nand
00 1
01 1
10 1
11 0

 

[Tom Del Rosso]

Rich Grise wrote:

The Control Data/Bendix G15, the one they had at my high school ca.
1965, had tubes.
http://members.iinet.net.au/%7Edgreen/docs.html

Incredibly, my high school didn't contain a single computer almost 20 years
later. In 1983 it had 2,800 students, 1 flight simulator, a few typewriters
in the library.


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[krw@att.bizzzzzzzzzzzz]

On Sat, 7 May 2011 10:44:13 -0400, "Tom Del Rosso" <td_03@verizon.net.invalid>
wrote:

Rich Grise wrote:
The Control Data/Bendix G15, the one they had at my high school ca.
1965, had tubes.
http://members.iinet.net.au/%7Edgreen/docs.html

Incredibly, my high school didn't contain a single computer almost 20 years
later. In 1983 it had 2,800 students, 1 flight simulator, a few typewriters
in the library.

The local university offered us a PLATO terminal (in '67) but the
superintendent's office refused, saying that if there was a computer in the
classroom students wouldn't learn math (a silly proposition even then). The
university then gave classes and free time on the 360/75 to any local high
school student who want it, doing an end-run around the school administration.
The college wanted to find out if high school kids could learn how to program
(not so silly, since CS was in the graduate school at the time). I took them
up on the offer both my junior and senior years. The CS types were a little
miffed that we got all the time we wanted (they certainly didn't) and were
competition for punch time.