### Re: Need to delay execution by 1 clk...

```Hi Kiran and all,

If this actor is constructed as one atomic-actor that models the eight
stages of execution, I would suggest that you re-build it as a composite
actor from eight diffent atmoic-actors (your own models and/or from
library actors).Each atomic actor in this model would be corresponding
to one of the eight stages of execution.

Pipeline your actors; in other words output of (actor1/stage 1) is
connected to input of (actor2/stage2);meanwhile all eight are
synchronous;i.e connected to the same main clock.

The DE director reacts to each positive edge as an event. The
running(execution) of the overall composite actor is a sequene of events
corresponding to each positive edge of the clock.

In this criteria, Consider two consecutive actors (one delivering to
the next) in (execution graph) ; at the positive edge both of them are
Fired such that at this instance(event) T ; (actorX) delivers its output
at time (T-1)to (actorX+1) and it produces simultaneously an output that
to be delivered to (actorX+1)in the next firing event(next positive
edge)at time (T+1).In other words the output token of actorX is reserved
(not changing) in the gap between two consecutive events.

for example :
assume
actorX output at T-1 = m
actorX output at T   = n

(ActorX reserves-stores(flipflop) a value =m for one clock cycle)

Then

actor X+1 processes an input = m at time T
actor X+1 processes an input = n at time T+1

Conclusion , if I understand your exact problem , this method could
do your job without a delay actor in between actorX and actor X+1.
Otherwise, insertion of a Timedelay with delay parameter of 1 could
help.

I hope that this would be helpful ...

THANKS for your time and interest

Best Regards,

Mohamed A.Salem

On Thu, 2003-11-27 at 13:06, Kiran SB wrote:
Hi
I am new to ptolemy (6 months).
Currently I am using PTII 3.0.2 for building(simulating) custom actors in the
DE domain, which are basically executional elements (of a reconfigurable
device).

In one particular situation I have an actor with 8 stages of execution.
During initialize I construct a Execution(Data) flow graph depending on the
selector settings in the actor.
I traverse through the graph and execute each stage in it during fire.
Now at one stage I need to create a delay of 1 clock.
The executional unit needs to sleep for a clock and proceed to the next stage.
Basically I need to forward time by a clock.
setCurrentTime (currentTime+1) might not be a good idea as it might cause
problems to the token's timestamp.
What is to be achieved is that the currentTime after this stage should be
t+1(say we started at t).
I don't know if I can use DEEventQueue in any way for this purpose.
Maybe its a wrong or a repeat question!
I have searched all group messages and couldn't find anybody with such a
requirement.
Can somebody help me out with this problem?

- kiran

mail for this list to: [EMAIL PROTECTED]

```

### Re: Need to delay execution by 1 clk...

```Thanks for the response...

TimedDelay just sends out a token after a specified delay (send (token, delay)).
what I am looking at is to stop(delay) the execution by a clock and proceed.
I could have used TimedDelay if I had to delay in a particular simulation.
But I need to delay inside an actor and not while sending out the Token.
Just somehow hold the execution for one clock. Its a flipflop kind of a device
which needs to hold the data for 1 clock and then give it out to the next stage of
execution.

- kiran

- Original Message -
From: Edward A Lee [EMAIL PROTECTED]
Date: Tue, 02 Dec 2003 15:23:31 -0800
To: Kiran SB [EMAIL PROTECTED]
Subject: Re: Need to delay execution by 1 clk...

Will the TimedDelay actor do what you need?

Edward Lee

At 04:06 PM 11/27/2003 +0500, Kiran SB wrote:
Hi
I am new to ptolemy (6 months).
Currently I am using PTII 3.0.2 for building(simulating) custom actors in the
DE domain, which are basically executional elements (of a reconfigurable
device).

In one particular situation I have an actor with 8 stages of execution.
During initialize I construct a Execution(Data) flow graph depending on the
selector settings in the actor.
I traverse through the graph and execute each stage in it during fire.
Now at one stage I need to create a delay of 1 clock.
The executional unit needs to sleep for a clock and proceed to the next stage.
Basically I need to forward time by a clock.
setCurrentTime (currentTime+1) might not be a good idea as it might cause
problems to the token's timestamp.
What is to be achieved is that the currentTime after this stage should be
t+1(say we started at t).
I don't know if I can use DEEventQueue in any way for this purpose.
Maybe its a wrong or a repeat question!
I have searched all group messages and couldn't find anybody with such a
requirement.
Can somebody help me out with this problem?

- kiran
--
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mail for this list to: [EMAIL PROTECTED]

Edward A. Lee, Professor
518 Cory Hall, UC Berkeley, Berkeley, CA 94720
phone: 510-642-0455, fax: 510-642-2739
[EMAIL PROTECTED], http://ptolemy.eecs.berkeley.edu/~eal

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mail for this list to: [EMAIL PROTECTED]

```

### Re: Need to delay execution by 1 clk...

```Hmm... Your problem statement is still ambiguous.

If you want the delay to be a real-time delay, then you can set
the synchronizeToRealTime parameter of the DEDirector.
If what you need is the effect of a latch, then you want
to combine the TimedDelay with the Previous actor (in the
domain-specific/DE library).
It's also possible that the actor you want is Sleep
(in the real-time library).
Edward

At 06:56 PM 12/3/2003 +0500, Kiran SB wrote:
Thanks for the response...

TimedDelay just sends out a token after a specified delay (send (token,
delay)).
what I am looking at is to stop(delay) the execution by a clock and proceed.
I could have used TimedDelay if I had to delay in a particular simulation.
But I need to delay inside an actor and not while sending out the Token.
Just somehow hold the execution for one clock. Its a flipflop kind of a device
which needs to hold the data for 1 clock and then give it out to the next
stage of
execution.

- kiran

- Original Message -
From: Edward A Lee [EMAIL PROTECTED]
Date: Tue, 02 Dec 2003 15:23:31 -0800
To: Kiran SB [EMAIL PROTECTED]
Subject: Re: Need to delay execution by 1 clk...

Will the TimedDelay actor do what you need?

Edward Lee

At 04:06 PM 11/27/2003 +0500, Kiran SB wrote:
Hi
I am new to ptolemy (6 months).
Currently I am using PTII 3.0.2 for building(simulating) custom actors
in the
DE domain, which are basically executional elements (of a reconfigurable
device).

In one particular situation I have an actor with 8 stages of execution.
During initialize I construct a Execution(Data) flow graph depending
on the
selector settings in the actor.
I traverse through the graph and execute each stage in it during fire.
Now at one stage I need to create a delay of 1 clock.
The executional unit needs to sleep for a clock and proceed to the
next stage.
Basically I need to forward time by a clock.
setCurrentTime (currentTime+1) might not be a good idea as it might cause
problems to the token's timestamp.
What is to be achieved is that the currentTime after this stage should be
t+1(say we started at t).
I don't know if I can use DEEventQueue in any way for this purpose.
Maybe its a wrong or a repeat question!
I have searched all group messages and couldn't find anybody with such a
requirement.
Can somebody help me out with this problem?

- kiran
--
__
Check out the latest SMS services @ http://www.linuxmail.org

---
-
mail for this list to: [EMAIL PROTECTED]

Edward A. Lee, Professor
518 Cory Hall, UC Berkeley, Berkeley, CA 94720
phone: 510-642-0455, fax: 510-642-2739
[EMAIL PROTECTED], http://ptolemy.eecs.berkeley.edu/~eal

--
__
Check out the latest SMS services @ http://www.linuxmail.org

Edward A. Lee, Professor
518 Cory Hall, UC Berkeley, Berkeley, CA 94720
phone: 510-642-0455, fax: 510-642-2739
[EMAIL PROTECTED], http://ptolemy.eecs.berkeley.edu/~eal

mail for this list to: [EMAIL PROTECTED]

```

### Re: Need to delay execution by 1 clk...

```Will the TimedDelay actor do what you need?

Edward Lee

At 04:06 PM 11/27/2003 +0500, Kiran SB wrote:
Hi
I am new to ptolemy (6 months).
Currently I am using PTII 3.0.2 for building(simulating) custom actors in the
DE domain, which are basically executional elements (of a reconfigurable
device).
In one particular situation I have an actor with 8 stages of execution.
During initialize I construct a Execution(Data) flow graph depending on the
selector settings in the actor.
I traverse through the graph and execute each stage in it during fire.
Now at one stage I need to create a delay of 1 clock.
The executional unit needs to sleep for a clock and proceed to the next stage.
Basically I need to forward time by a clock.
setCurrentTime (currentTime+1) might not be a good idea as it might cause
problems to the token's timestamp.
What is to be achieved is that the currentTime after this stage should be
t+1(say we started at t).
I don't know if I can use DEEventQueue in any way for this purpose.
Maybe its a wrong or a repeat question!
I have searched all group messages and couldn't find anybody with such a
requirement.
Can somebody help me out with this problem?
- kiran
--
__
Check out the latest SMS services @ http://www.linuxmail.org