send q VRf-Sequencing_Pins ww JOEL_DUNSMORE@HP-Sonoma-om1.om.hp.com vrf
from: Greg Goebel / HP-MXD
gvg@lvld.hp.com / 970-679-3030 / FAX 970-679-5971
website: ftp://fcext3.external.hp.com/dist/mxd/index.html
to: VRf-Joel Dunsmore
date: Wednesday, 06 August 1997 1524 MDT
Joel:
As a rule I would use sequence-out pins, but I've never analyzed the issue
in such detail as to give a definitive answer.
We did have a very odd problem with the Japanese reporting that a program
worked faster on VEE 3.0 than it did on VEE 4.0. Turned out their Timer
was triggered off the data output, not the sequence-out pin, and since there
were a number of different objects snaked off the data output pin the
execution order varied, changing the time.
We wired it to the sequencing pins and it worked fine.
I noticed the paths to my address from you are quite convoluted -- see below.
I think this may have something to do with the FUBAR on Susan Manson's eval
feedback. Could you send a TEST-PLEASE DISREGARD message to the VRf so I
can inspect your paths for a possible clue?
[%%] regards -- gvg
--------------------------------- cut here ----------------------------------
>From: JOEL_DUNSMORE@HP-Sonoma-om1.om.hp.com
Date: Wed, 6 Aug 97 14:13:23 -0700
Subject: Re: VRf-Junctions in Vee4, FIFO?
Item Subject: VRf-Junctions in Vee4, FIFO?
Greg,
Thanks for the reply.
I was able to get everything working by using the Sequence out of the
upper device to sequence the next lower device, just as in your
picture.
What I had tried originally is using the DATA output of the upper
device to trigger the sequence of the next lower device:
---- -----
1 |___________________| Juntion
---- |
|
-----|
|
-----
2 |------------------
-----
I thought it was a "good thing" to use data propogation to control the
sequence flow, and I did watch the "bouncing ball" to see that the
data inputs to the junctions did occur in the proper order. I guess I
was lucky in the Vee 3 in that the order I hooked up the wires was the
order I wanted the data, but I am surprised that the data flow doing
the sequencing doesn't work.
Is there a better, intuitive way to know if or when to use data to
sequence items, or do you always want to use sequence out pins.
Thanks, Joel
from: Greg Goebel / HP-MXD
gvg@lvld.hp.com / 970-679-3030 / FAX 970-679-5971
website: ftp://fcext3.external.hp.com/dist/mxd/index.html
to: VRf-Joel Dunsmore
date: Wednesday, 06 August 1997 1524 MDT
Joel:
As a rule I would use sequence-out pins, but I've never analyzed the issue
in such detail as to give a definitive answer.
We did have a very odd problem with the Japanese reporting that a program
worked faster on VEE 3.0 than it did on VEE 4.0. Turned out their Timer
was triggered off the data output, not the sequence-out pin, and since there
were a number of different objects snaked off the data output pin the
execution order varied, changing the time.
We wired it to the sequencing pins and it worked fine.
I noticed the paths to my address from you are quite convoluted -- see below.
I think this may have something to do with the FUBAR on Susan Manson's eval
feedback. Could you send a TEST-PLEASE DISREGARD message to the VRf so I
can inspect your paths for a possible clue?
[%%] regards -- gvg
--------------------------------- cut here ----------------------------------
>From: JOEL_DUNSMORE@HP-Sonoma-om1.om.hp.com
Date: Wed, 6 Aug 97 14:13:23 -0700
Subject: Re: VRf-Junctions in Vee4, FIFO?
Item Subject: VRf-Junctions in Vee4, FIFO?
Greg,
Thanks for the reply.
I was able to get everything working by using the Sequence out of the
upper device to sequence the next lower device, just as in your
picture.
What I had tried originally is using the DATA output of the upper
device to trigger the sequence of the next lower device:
---- -----
1 |___________________| Juntion
---- |
|
-----|
|
-----
2 |------------------
-----
I thought it was a "good thing" to use data propogation to control the
sequence flow, and I did watch the "bouncing ball" to see that the
data inputs to the junctions did occur in the proper order. I guess I
was lucky in the Vee 3 in that the order I hooked up the wires was the
order I wanted the data, but I am surprised that the data flow doing
the sequencing doesn't work.
Is there a better, intuitive way to know if or when to use data to
sequence items, or do you always want to use sequence out pins.
Thanks, Joel