AoE3 D-flips and glitches

Jim Thompson · Jan 25, 2016

On Sun, 24 Jan 2016 14:27:10 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:

On Sun, 24 Jan 2016 16:06:43 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

[snip]

Engineers' courtship rituals are obviously a neglected field of
ethnology. We physicists wave our arms and make funny noises. Works
every time. (At least, I'm one-for-one, as of 32 years ago.)

Cheers

Phil Hobbs

We engineers do the funny noises, but we don't wave our arms, we wave
something else ;-)

56 years as of March 1 !!

...Jim Thompson

John Larkin · Jan 25, 2016

On Mon, 25 Jan 2016 08:10:46 -0800 (PST), George Herold
<gherold@teachspin.com> wrote:

On Sunday, January 24, 2016 at 4:06:59 PM UTC-5, Phil Hobbs wrote:
On 01/23/2016 11:36 PM, John Larkin wrote:
On Sat, 23 Jan 2016 17:12:52 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 01/21/2016 11:27 PM, John Larkin wrote:
On Wed, 20 Jan 2016 12:01:40 -0800 (PST), George Herold
gherold@teachspin.com> wrote:

On Wednesday, January 20, 2016 at 2:59:39 PM UTC-5, George Herold wrote:
On Tuesday, January 19, 2016 at 4:23:33 PM UTC-5, Tim Wescott wrote:
On Tue, 19 Jan 2016 10:23:19 -0800, George Herold wrote:

As part of reintroducing myself to digital electronics,
I've been reading chapter 10 of AoE3. My question regards the footnote
(60) on page 738. Fig 10.73 shows how a rising edge D-FF can make a
glitch. Putting an inverter in the clk line might make a glitch at the
leading edge..
(if the D-flip is faster than the inverter.) So the rather obvious
answer is to stick the inverter before the clock input of the D-flip..
giving two propagation delays in that section.... Is that the "right"
answer?

Tia George H.

Post an ASCII-art schematic? I don't think I have revision 3.

--
www.wescottdesign.com

No third edition? Treat yourself and spend the money.
Here's a picture from Aoe3
https://www.dropbox.com/s/66qxydq710bjjgg/pg738.JPG?dl=0

I've got a similar little glitch in my circuit. A D-flip turns off with the rising
edge of the clock pulse, that goes to a Nand gate, but doesn't get there in time to
turn off the gate before a little bit of the (same) clk edge gets through.

It's at the end after all the counting is done and doesn't have any effect...
Still (according to H&H) it's bad form.

Here it is..
https://www.dropbox.com/s/vrx7w8aljmofik6/TEK0000.BMP?dl=0

Ch1 is the clock
Ch2 is the output pulse (negative true)
C3 is the signal after the Nand gate that goes to the counters.

Here's a pic where I'm clocking at 1 MHz... so you can see clk and glitch.
https://www.dropbox.com/s/vrx7w8aljmofik6/TEK0000.BMP?dl=0
dang wrong pic again... sorry,
https://www.dropbox.com/s/frz91exmlbvwluf/TEK0001.BMP?dl=0
better.

Hey, Maybe if instead of gating the clock I can just disable the counter...

Have I said lately how much I like talking to you guys... even when you're silent
you still give me ideas :^)

Cheers,
George H.

The True Gospel of synchronous logic requires that one master clock go
the the clock inputs of a lot of d-flops, and nowhere else.

TI once had a huge project called ASC, the Advanced Scientific
Computer. Designers were required to strap the /preset and /clear of
all flipflops to Vcc; they couldn't even be used for powerup reset.

The project was a failure, but it did result in a truly superior
technique for shooting rubber bands at the butts of admins. Several
marriages ensued.

Since I'm pretty sure you never worked at TI, and your lovely wife is a
speech pathologist, I'd love to hear how you heard about this. Could be
useful for some of the younger younger generation.

A veteran of the project worked for me at TANO in New Orleans.

I could show you the rubber band thing in a few seconds. I haven't
already?

In words,

Place left hand with thumb pointing at your face, index finger
pointing away.

Stretch a fat rubber band between those fingers.

Place your right index finger on the stretched band, inside-right
side, near thumb, and hook it and pull forward, transferring the
tension from left index to right index. You now have a band with a lot
more tension on one side than the other, between left thumb and right
index.

Stretch hard, aim at admin, fire.

The band spins and doesn't tumble. It goes like a bullet. Whack.

Engineers' courtship rituals are obviously a neglected field of
ethnology. We physicists wave our arms and make funny noises. Works
every time. (At least, I'm one-for-one, as of 32 years ago.)

Yes I thought you were asking how rubber bands lead to matrimony.
Are these female coders snipping at the little derrieres of the male
admin's. Or males taking aim at some female mega-fhany... and how
does that lead to courtship? These are important questions
for young geeks.

I have observed the mating habits, and mates, of male engineers for
some time. I haven't observed enough cases of female engineers to see
the patterns, but that would sure be interesting too.

I have two female engineers now. I haven't met one of their husbands,
but I have met one of their wives.

--

John Larkin Highland Technology, Inc

lunatic fringe electronics

Phil Hobbs · Jan 26, 2016

On 01/25/2016 11:20 AM, Jim Thompson wrote:

On Sun, 24 Jan 2016 14:27:10 -0700, Jim Thompson
To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:

On Sun, 24 Jan 2016 16:06:43 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

[snip]

Engineers' courtship rituals are obviously a neglected field of
ethnology. We physicists wave our arms and make funny noises. Works
every time. (At least, I'm one-for-one, as of 32 years ago.)

Cheers

Phil Hobbs

We engineers do the funny noises, but we don't wave our arms, we wave
something else ;-)

56 years as of March 1 !!

...Jim Thompson

However sometimes we make typos... it's March _31_

...Jim Thompson

How's the BH doing?

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510

hobbs at electrooptical dot net
http://electrooptical.net

Jim Thompson · Jan 26, 2016

On Mon, 25 Jan 2016 15:48:15 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

On 01/25/2016 11:20 AM, Jim Thompson wrote:
On Sun, 24 Jan 2016 14:27:10 -0700, Jim Thompson
To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:

On Sun, 24 Jan 2016 16:06:43 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

[snip]

Engineers' courtship rituals are obviously a neglected field of
ethnology. We physicists wave our arms and make funny noises. Works
every time. (At least, I'm one-for-one, as of 32 years ago.)

Cheers

Phil Hobbs

We engineers do the funny noises, but we don't wave our arms, we wave
something else ;-)

56 years as of March 1 !!

...Jim Thompson

However sometimes we make typos... it's March _31_

...Jim Thompson

How's the BH doing?

Cheers

Phil Hobbs

Phil Hobbs · Jan 26, 2016

On 01/25/2016 04:15 PM, Jim Thompson wrote:

On Mon, 25 Jan 2016 15:48:15 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 01/25/2016 11:20 AM, Jim Thompson wrote:
On Sun, 24 Jan 2016 14:27:10 -0700, Jim Thompson
To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:

On Sun, 24 Jan 2016 16:06:43 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

[snip]

Engineers' courtship rituals are obviously a neglected field of
ethnology. We physicists wave our arms and make funny noises. Works
every time. (At least, I'm one-for-one, as of 32 years ago.)

Cheers

Phil Hobbs

We engineers do the funny noises, but we don't wave our arms, we wave
something else ;-)

56 years as of March 1 !!

...Jim Thompson

However sometimes we make typos... it's March _31_

...Jim Thompson

How's the BH doing?

Cheers

Phil Hobbs

Scheduled to see a neurosurgeon and they're not saying what the MRI
showed :-(

...Jim Thompson

Nervous-making for sure. Still praying.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510

hobbs at electrooptical dot net
http://electrooptical.net

Jim Thompson · Jan 26, 2016

On Mon, 25 Jan 2016 20:30:44 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

On 01/25/2016 04:15 PM, Jim Thompson wrote:
On Mon, 25 Jan 2016 15:48:15 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 01/25/2016 11:20 AM, Jim Thompson wrote:
On Sun, 24 Jan 2016 14:27:10 -0700, Jim Thompson
To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:

On Sun, 24 Jan 2016 16:06:43 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

[snip]

Engineers' courtship rituals are obviously a neglected field of
ethnology. We physicists wave our arms and make funny noises. Works
every time. (At least, I'm one-for-one, as of 32 years ago.)

Cheers

Phil Hobbs

We engineers do the funny noises, but we don't wave our arms, we wave
something else ;-)

56 years as of March 1 !!

...Jim Thompson

However sometimes we make typos... it's March _31_

...Jim Thompson

How's the BH doing?

Cheers

Phil Hobbs

Scheduled to see a neurosurgeon and they're not saying what the MRI
showed :-(

...Jim Thompson

Nervous-making for sure. Still praying.

Cheers

Phil Hobbs

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