Timing Diagrams
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Timing Diagrams

 
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Ron J
Guest
Posted: Wed Dec 07, 2005 5:35 pm    Post subject: Timing Diagrams Reply with quote
Happy Holidays!

Where can I find info on timing diagrams? I would like to learn them
because I am trying to learn PIC programming and also I2C bus, but I am
confuse with timing diagrams.

Any help?

Thanks!

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Ron J
Guest
Posted: Wed Dec 07, 2005 5:35 pm    Post subject: Re: Timing Diagrams Reply with quote
Hello PeteS,

Thanks much for the kind reply! Do you know of a website with pictures
so I can understand more?
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PeteS
Guest
Posted: Wed Dec 07, 2005 5:35 pm    Post subject: Re: Timing Diagrams Reply with quote
Ron J wrote:
Quote:
Happy Holidays!

Where can I find info on timing diagrams? I would like to learn them
because I am trying to learn PIC programming and also I2C bus, but I am
confuse with timing diagrams.

Any help?

Thanks!

Timing diagrams show the relationships required between various signals
(when in a datasheet) for something to work. There are specific timing
statements such as 'setup time' (the amount of time data must be stable
before an active clock edge) and 'hold time' (the amount of time a
signal must remain stable after a valid clock edge).

They really aren't difficult to understand at all.

Cheers

PeteS

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Ron J
Guest
Posted: Wed Dec 07, 2005 5:35 pm    Post subject: Re: Timing Diagrams Reply with quote
Hello,

I have that document and the timing diagrams are Greek to me -- for
now. For instance, I don't understand Figure 4 very well especially
when the timing diagrams "cross" each other. Can you explain?
Thanks!
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Guest
Posted: Wed Dec 07, 2005 5:35 pm    Post subject: Re: Timing Diagrams Reply with quote
Quote:
Happy Holidays!
Where can I find info on timing diagrams? I would like to learn them
because I am trying to learn PIC programming and also I2C bus, but I am
confuse with timing diagrams.
Any help?
Thanks!

Nice public email address.

You might want to review the I2C spec:
http://www.semiconductors.philips.com/acrobat_download/literature/9398/39340011.pdf
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Pooh Bear
Guest
Posted: Thu Dec 08, 2005 1:35 am    Post subject: Re: Timing Diagrams Reply with quote
Ron J wrote:

Quote:
Hello PeteS,

Thanks much for the kind reply! Do you know of a website with pictures
so I can understand more?

Think of them as being like what you'd expect to see on a scope if you
probed the pins.

Graham
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Pooh Bear
Guest
Posted: Thu Dec 08, 2005 1:35 am    Post subject: Re: Timing Diagrams Reply with quote
Ron J wrote:

Quote:
Hello,

I have that document and the timing diagrams are Greek to me -- for
now. For instance, I don't understand Figure 4 very well especially
when the timing diagrams "cross" each other. Can you explain?
Thanks!

The 'cross' as you call it on SDA, the serial data line, indicates
where the data state is meant ' allowed to change ( if it needs to ).
See the text note underneath and the relationship to SCL, the serial
clock. I.e. data shouldn't change when SCL is high.

Graham
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Rich Grise
Guest
Posted: Thu Dec 08, 2005 9:35 am    Post subject: Re: Timing Diagrams Reply with quote
Ron J wrote:

Quote:
Happy Holidays!

Where can I find info on timing diagrams? I would like to learn them
because I am trying to learn PIC programming and also I2C bus, but I am
confuse with timing diagrams.

Well, it's a chart of what happens when. The X axis is time, as if you
were timing a race, and the Y axis is the states of various signals
along that time-line.

What part is it that you're having trouble with?

Thanks,
Rich
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Jasen Betts
Guest
Posted: Thu Dec 08, 2005 3:32 pm    Post subject: Re: Timing Diagrams Reply with quote
On 2005-12-07, Ron J <bigschlong@gmail.com> wrote:
Quote:
Hello PeteS,

Thanks much for the kind reply! Do you know of a website with pictures
so I can understand more?

Think of them as, a stack of a graphs of voltage against time
you'll need to use a fixed pitch font to read the rest of this
courier is a good choice.

_____ ____ ____ ____
\ / \/ \/
\________/\____/\____/

voltage ||voltage ||high||high|| high
is high ||is low || or || or ||
|| ||low ||low ||
|| || || ||
~~~~~~~~~~~~~~~~~~~~~~~~~~ voltage is changing (or not)


_____ ______
\ /
A \________/
| |
__________ <5ms
\
B \_____________

| | | |
Quote:
10ms >20ms

voltage B stays high for atleast 10ms after voltage A goes low
voltage A stat low for atleast 20ms after voltage b goes low
the rise time on voltage A is less than 5ms.


Bye.
Jasen
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Ron J
Guest
Posted: Thu Dec 08, 2005 5:35 pm    Post subject: Re: Timing Diagrams Reply with quote
Thanks, all! Thanks Jasen!

That is really helpful!
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ehsjr
Guest
Posted: Fri Dec 09, 2005 12:49 am    Post subject: Re: Timing Diagrams Reply with quote
Jasen Betts wrote:
Quote:
On 2005-12-07, Ron J <bigschlong@gmail.com> wrote:

Hello PeteS,

Thanks much for the kind reply! Do you know of a website with pictures
so I can understand more?


Think of them as, a stack of a graphs of voltage against time
you'll need to use a fixed pitch font to read the rest of this
courier is a good choice.

_____ ____ ____ ____
\ / \/ \/
\________/\____/\____/

voltage ||voltage ||high||high|| high
is high ||is low || or || or ||
|| ||low ||low ||
|| || || ||
~~~~~~~~~~~~~~~~~~~~~~~~~~ voltage is changing (or not)


_____ ______
\ /
A \________/
| |
__________ <5ms
\
B \_____________

| | | |
10ms >20ms

voltage B stays high for atleast 10ms after voltage A goes low
voltage A stat low for atleast 20ms after voltage b goes low
the rise time on voltage A is less than 5ms.


Bye.
Jasen

Nice drawings!
Ed
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Rich Grise
Guest
Posted: Fri Dec 09, 2005 1:35 am    Post subject: Re: Timing Diagrams Reply with quote
On Thu, 08 Dec 2005 18:49:53 +0000, ehsjr wrote:

Quote:
Nice drawings!
Ed

<AOL>
Me, Too!
</AOL>
;-)
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neon



Joined: 25 Feb 2006
Posts: 570
Posted: Sun Mar 05, 2006 11:04 pm    Post subject: Reply with quote
cross is a reference point where by a trigger event is se to ocurr and/or a gate point of triggering
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