On Mar 30, 8:09 pm, "Peter Alfke" <a...@sbcglobal.net> wrote:
> Weng, I am glad you liked the paper. Here it is:http://www.sunburst-design.com/papers/CummingsSNUG2002SJ_FIFO2.pdf
>
> Both Cliff Cummins and I are deeply involved in the peculiarities of
> asynchr. FIFOs. When we agreed to co-author this paper, Cliff was very
> suspicious that my solution would not work properly, so I had to work
> very hard to (almost) convince him. That definitely improved the
> paper, which was then voted "best paper of the conference"(Synopsys
> User Group, 2002)
> Nice memories...
> Thanks
> Peter Alfke
>
> On Mar 27, 10:03 pm, "Weng Tianxiang" <wtx...@gmail.com> wrote:
>
>
>
> > On Mar 27, 7:15 pm, "Peter Alfke" <a...@sbcglobal.net> wrote:
>
> > > Weng, you seem to believe that there is a one-to-one corresponcence
> > > between the content of a patent and the Xilinx implementation.
> > > That is not necessarily so.
> > > If you want to learn what a certain company is interested in, then
> > > looking at patents is meaningful, (but you still suffer from the 2-
> > > to-4year delay in patent issuing.)
> > > If you want to design an ASIC, intimate knowledge of the FPGA may be
> > > more hindrance than help. The architecture and circuit trade-offs are
> > > completely different.
> > > Keep studying...
> > > Peter Alfke
> > > ==========================
>
> > > On Mar 27, 6:10 pm, "Weng Tianxiang" <wtx...@gmail.com> wrote:
>
> > > > On Mar 27, 3:25 pm, "John_H" <newsgr...@johnhandwork.com> wrote:
>
> > > > > Is page 158 of the Virtex-5 User Guide
>
> > > > > http://direct.xilinx.com/bvdocs/userguides/ug190.pdf
>
> > > > > just too darned simple for you? Are you trying to understand the operation
> > > > > of the part from the detailed silicon level tricks that may or may not be
> > > > > applicable for this part of the device? I tried looking at a DDR IOB cell
> > > > > patent once and found it to be interestingly disconnected from my RTL and
> > > > > chip level design experience. If you are into physical level design of CMOS
> > > > > chips on advanced processes you have a chance of understanding how things
> > > > > come together. If all you want to know is how that chip will work for you,
> > > > > use the User's Guide!
>
> > > > > I don't have to know about the metal casting used for the alternator in my
> > > > > car to understand how the alternator works. You don't need patents to
> > > > > understand the SLICE_L.
>
> > > > > - John_H
>
> > > > > "Weng Tianxiang" <wtx...@gmail.com> wrote in message
>
> > > > >news:1175036266.831589.180920@b75g2000hsg.googlegroups.com...
>
> > > > > > Hi,
> > > > > > When I am turning to Xilinx Virtex-5 new chips from Virtex-II, I would
> > > > > > like to know which patents filed by Xilinx to disclose the contents of
> > > > > > Slice L.
>
> > > > > > Slice M is too complex for me to fully understand at the moment and
> > > > > > just knowledge of Slice L is good enough for me to start with Virtex-5
> > > > > > as basic knowledge for it.
>
> > > > > > Thank you.
>
> > > > > > Weng- Hide quoted text -
>
> > > > > - Show quoted text -
>
> > > > Hi John,
> > > > Yes, I am interested in ASIC design of Slice L and want someone's help
> > > > to locate the patent filed by Xilinx that contains the contents of
> > > > Slice L. I am not interested in slice M that is too complex to me now.
>
> > > > I have already printed the user manual you indicated and carefully
> > > > read it. But it doesn't meet my curiority.
>
> > > > Weng- Hide quoted text -
>
> > > - Show quoted text -
>
> > Hi Peter,
> > Thank you for your advice.
>
> > I like reading and learning. Your paper about asynchronous FIFO
> > cooperated with another engineer is the best article I have read in my
> > life.
>
> > Weng- Hide quoted text -
>
> - Show quoted text -
Hi Peter,
Yes, I had printed the paper 5 years ago and read it very carefully
and the paper teaches me how to understand and handle the asynchronous
situation.
The paper not only won the first prize of the conference, but also won
my highest comment: it is the best paper I have read in my life !!!
Thank you and Cliff Cummins for the excellent paper that really made
contributions to the VHDL world.
Weng
Reply by Peter Alfke●March 31, 20072007-03-31
Weng, I am glad you liked the paper. Here it is:
http://www.sunburst-design.com/papers/CummingsSNUG2002SJ_FIFO2.pdf
Both Cliff Cummins and I are deeply involved in the peculiarities of
asynchr. FIFOs. When we agreed to co-author this paper, Cliff was very
suspicious that my solution would not work properly, so I had to work
very hard to (almost) convince him. That definitely improved the
paper, which was then voted "best paper of the conference"(Synopsys
User Group, 2002)
Nice memories...
Thanks
Peter Alfke
On Mar 27, 10:03 pm, "Weng Tianxiang" <wtx...@gmail.com> wrote:
> On Mar 27, 7:15 pm, "Peter Alfke" <a...@sbcglobal.net> wrote:
>
>
>
> > Weng, you seem to believe that there is a one-to-one corresponcence
> > between the content of a patent and the Xilinx implementation.
> > That is not necessarily so.
> > If you want to learn what a certain company is interested in, then
> > looking at patents is meaningful, (but you still suffer from the 2-
> > to-4year delay in patent issuing.)
> > If you want to design an ASIC, intimate knowledge of the FPGA may be
> > more hindrance than help. The architecture and circuit trade-offs are
> > completely different.
> > Keep studying...
> > Peter Alfke
> > ==========================
>
> > On Mar 27, 6:10 pm, "Weng Tianxiang" <wtx...@gmail.com> wrote:
>
> > > On Mar 27, 3:25 pm, "John_H" <newsgr...@johnhandwork.com> wrote:
>
> > > > Is page 158 of the Virtex-5 User Guide
>
> > > > http://direct.xilinx.com/bvdocs/userguides/ug190.pdf
>
> > > > just too darned simple for you? Are you trying to understand the operation
> > > > of the part from the detailed silicon level tricks that may or may not be
> > > > applicable for this part of the device? I tried looking at a DDR IOB cell
> > > > patent once and found it to be interestingly disconnected from my RTL and
> > > > chip level design experience. If you are into physical level design of CMOS
> > > > chips on advanced processes you have a chance of understanding how things
> > > > come together. If all you want to know is how that chip will work for you,
> > > > use the User's Guide!
>
> > > > I don't have to know about the metal casting used for the alternator in my
> > > > car to understand how the alternator works. You don't need patents to
> > > > understand the SLICE_L.
>
> > > > - John_H
>
> > > > "Weng Tianxiang" <wtx...@gmail.com> wrote in message
>
> > > >news:1175036266.831589.180920@b75g2000hsg.googlegroups.com...
>
> > > > > Hi,
> > > > > When I am turning to Xilinx Virtex-5 new chips from Virtex-II, I would
> > > > > like to know which patents filed by Xilinx to disclose the contents of
> > > > > Slice L.
>
> > > > > Slice M is too complex for me to fully understand at the moment and
> > > > > just knowledge of Slice L is good enough for me to start with Virtex-5
> > > > > as basic knowledge for it.
>
> > > > > Thank you.
>
> > > > > Weng- Hide quoted text -
>
> > > > - Show quoted text -
>
> > > Hi John,
> > > Yes, I am interested in ASIC design of Slice L and want someone's help
> > > to locate the patent filed by Xilinx that contains the contents of
> > > Slice L. I am not interested in slice M that is too complex to me now.
>
> > > I have already printed the user manual you indicated and carefully
> > > read it. But it doesn't meet my curiority.
>
> > > Weng- Hide quoted text -
>
> > - Show quoted text -
>
> Hi Peter,
> Thank you for your advice.
>
> I like reading and learning. Your paper about asynchronous FIFO
> cooperated with another engineer is the best article I have read in my
> life.
>
> Weng
Reply by Weng Tianxiang●March 30, 20072007-03-30
On Mar 27, 8:44 pm, "Paul Leventis" <paul.leven...@gmail.com> wrote:
> Hi,
>
> Due to recent changes, the 2-to-4 year delay has been reduced
> somewhat. If you go tohttp://www.uspto.gov/patft/, you can now view
> published applications. I'm not sure how soon after filing that an
> application is made available to the public, but based on random
> searches of the patents of my colleagues it seems like it is in the
> neighborhood of 1 year.
>
> I agree with Peter -- rarely will you see what exactly was implemented
> in the chip in a patent; it is usually some combination of a bunch of
> patents mixed with good engineering and a dash of trade secrets. And
> it can be hard to tell what a patent was really about by the time it
> gets turned into legalize...
>
> - Paul
Hi Paul,
Can you help identify where I can find the patent application:
U.S. Appl No. 11/151/796, filed Jun. 14, 2005.
It is said that a patent application will be published after 180 days
since its file date. But from U.S. Patent Office, I couldn't find it.
Why? Or any other technology to find it? Or it may be delayed longer
than 180 days?
Weng
Reply by Weng Tianxiang●March 28, 20072007-03-28
On Mar 27, 7:15 pm, "Peter Alfke" <a...@sbcglobal.net> wrote:
> Weng, you seem to believe that there is a one-to-one corresponcence
> between the content of a patent and the Xilinx implementation.
> That is not necessarily so.
> If you want to learn what a certain company is interested in, then
> looking at patents is meaningful, (but you still suffer from the 2-
> to-4year delay in patent issuing.)
> If you want to design an ASIC, intimate knowledge of the FPGA may be
> more hindrance than help. The architecture and circuit trade-offs are
> completely different.
> Keep studying...
> Peter Alfke
> ==========================
>
> On Mar 27, 6:10 pm, "Weng Tianxiang" <wtx...@gmail.com> wrote:
>
>
>
> > On Mar 27, 3:25 pm, "John_H" <newsgr...@johnhandwork.com> wrote:
>
> > > Is page 158 of the Virtex-5 User Guide
>
> > > http://direct.xilinx.com/bvdocs/userguides/ug190.pdf
>
> > > just too darned simple for you? Are you trying to understand the operation
> > > of the part from the detailed silicon level tricks that may or may not be
> > > applicable for this part of the device? I tried looking at a DDR IOB cell
> > > patent once and found it to be interestingly disconnected from my RTL and
> > > chip level design experience. If you are into physical level design of CMOS
> > > chips on advanced processes you have a chance of understanding how things
> > > come together. If all you want to know is how that chip will work for you,
> > > use the User's Guide!
>
> > > I don't have to know about the metal casting used for the alternator in my
> > > car to understand how the alternator works. You don't need patents to
> > > understand the SLICE_L.
>
> > > - John_H
>
> > > "Weng Tianxiang" <wtx...@gmail.com> wrote in message
>
> > >news:1175036266.831589.180920@b75g2000hsg.googlegroups.com...
>
> > > > Hi,
> > > > When I am turning to Xilinx Virtex-5 new chips from Virtex-II, I would
> > > > like to know which patents filed by Xilinx to disclose the contents of
> > > > Slice L.
>
> > > > Slice M is too complex for me to fully understand at the moment and
> > > > just knowledge of Slice L is good enough for me to start with Virtex-5
> > > > as basic knowledge for it.
>
> > > > Thank you.
>
> > > > Weng- Hide quoted text -
>
> > > - Show quoted text -
>
> > Hi John,
> > Yes, I am interested in ASIC design of Slice L and want someone's help
> > to locate the patent filed by Xilinx that contains the contents of
> > Slice L. I am not interested in slice M that is too complex to me now.
>
> > I have already printed the user manual you indicated and carefully
> > read it. But it doesn't meet my curiority.
>
> > Weng- Hide quoted text -
>
> - Show quoted text -
Hi Peter,
Thank you for your advice.
I like reading and learning. Your paper about asynchronous FIFO
cooperated with another engineer is the best article I have read in my
life.
Weng
Reply by Paul Leventis●March 28, 20072007-03-28
Hi,
Due to recent changes, the 2-to-4 year delay has been reduced
somewhat. If you go to http://www.uspto.gov/patft/, you can now view
published applications. I'm not sure how soon after filing that an
application is made available to the public, but based on random
searches of the patents of my colleagues it seems like it is in the
neighborhood of 1 year.
I agree with Peter -- rarely will you see what exactly was implemented
in the chip in a patent; it is usually some combination of a bunch of
patents mixed with good engineering and a dash of trade secrets. And
it can be hard to tell what a patent was really about by the time it
gets turned into legalize...
- Paul
Reply by Peter Alfke●March 27, 20072007-03-27
Weng, you seem to believe that there is a one-to-one corresponcence
between the content of a patent and the Xilinx implementation.
That is not necessarily so.
If you want to learn what a certain company is interested in, then
looking at patents is meaningful, (but you still suffer from the 2-
to-4year delay in patent issuing.)
If you want to design an ASIC, intimate knowledge of the FPGA may be
more hindrance than help. The architecture and circuit trade-offs are
completely different.
Keep studying...
Peter Alfke
==========================
On Mar 27, 6:10 pm, "Weng Tianxiang" <wtx...@gmail.com> wrote:
> On Mar 27, 3:25 pm, "John_H" <newsgr...@johnhandwork.com> wrote:
>
>
>
> > Is page 158 of the Virtex-5 User Guide
>
> > http://direct.xilinx.com/bvdocs/userguides/ug190.pdf
>
> > just too darned simple for you? Are you trying to understand the operation
> > of the part from the detailed silicon level tricks that may or may not be
> > applicable for this part of the device? I tried looking at a DDR IOB cell
> > patent once and found it to be interestingly disconnected from my RTL and
> > chip level design experience. If you are into physical level design of CMOS
> > chips on advanced processes you have a chance of understanding how things
> > come together. If all you want to know is how that chip will work for you,
> > use the User's Guide!
>
> > I don't have to know about the metal casting used for the alternator in my
> > car to understand how the alternator works. You don't need patents to
> > understand the SLICE_L.
>
> > - John_H
>
> > "Weng Tianxiang" <wtx...@gmail.com> wrote in message
>
> >news:1175036266.831589.180920@b75g2000hsg.googlegroups.com...
>
> > > Hi,
> > > When I am turning to Xilinx Virtex-5 new chips from Virtex-II, I would
> > > like to know which patents filed by Xilinx to disclose the contents of
> > > Slice L.
>
> > > Slice M is too complex for me to fully understand at the moment and
> > > just knowledge of Slice L is good enough for me to start with Virtex-5
> > > as basic knowledge for it.
>
> > > Thank you.
>
> > > Weng- Hide quoted text -
>
> > - Show quoted text -
>
> Hi John,
> Yes, I am interested in ASIC design of Slice L and want someone's help
> to locate the patent filed by Xilinx that contains the contents of
> Slice L. I am not interested in slice M that is too complex to me now.
>
> I have already printed the user manual you indicated and carefully
> read it. But it doesn't meet my curiority.
>
> Weng
Reply by Weng Tianxiang●March 27, 20072007-03-27
On Mar 27, 3:25 pm, "John_H" <newsgr...@johnhandwork.com> wrote:
> Is page 158 of the Virtex-5 User Guide
>
> http://direct.xilinx.com/bvdocs/userguides/ug190.pdf
>
> just too darned simple for you? Are you trying to understand the operation
> of the part from the detailed silicon level tricks that may or may not be
> applicable for this part of the device? I tried looking at a DDR IOB cell
> patent once and found it to be interestingly disconnected from my RTL and
> chip level design experience. If you are into physical level design of CMOS
> chips on advanced processes you have a chance of understanding how things
> come together. If all you want to know is how that chip will work for you,
> use the User's Guide!
>
> I don't have to know about the metal casting used for the alternator in my
> car to understand how the alternator works. You don't need patents to
> understand the SLICE_L.
>
> - John_H
>
> "Weng Tianxiang" <wtx...@gmail.com> wrote in message
>
> news:1175036266.831589.180920@b75g2000hsg.googlegroups.com...
>
>
>
> > Hi,
> > When I am turning to Xilinx Virtex-5 new chips from Virtex-II, I would
> > like to know which patents filed by Xilinx to disclose the contents of
> > Slice L.
>
> > Slice M is too complex for me to fully understand at the moment and
> > just knowledge of Slice L is good enough for me to start with Virtex-5
> > as basic knowledge for it.
>
> > Thank you.
>
> > Weng- Hide quoted text -
>
> - Show quoted text -
Hi John,
Yes, I am interested in ASIC design of Slice L and want someone's help
to locate the patent filed by Xilinx that contains the contents of
Slice L. I am not interested in slice M that is too complex to me now.
I have already printed the user manual you indicated and carefully
read it. But it doesn't meet my curiority.
Weng
Reply by John_H●March 27, 20072007-03-27
Is page 158 of the Virtex-5 User Guide
http://direct.xilinx.com/bvdocs/userguides/ug190.pdf
just too darned simple for you? Are you trying to understand the operation
of the part from the detailed silicon level tricks that may or may not be
applicable for this part of the device? I tried looking at a DDR IOB cell
patent once and found it to be interestingly disconnected from my RTL and
chip level design experience. If you are into physical level design of CMOS
chips on advanced processes you have a chance of understanding how things
come together. If all you want to know is how that chip will work for you,
use the User's Guide!
I don't have to know about the metal casting used for the alternator in my
car to understand how the alternator works. You don't need patents to
understand the SLICE_L.
- John_H
"Weng Tianxiang" <wtxwtx@gmail.com> wrote in message
news:1175036266.831589.180920@b75g2000hsg.googlegroups.com...
> Hi,
> When I am turning to Xilinx Virtex-5 new chips from Virtex-II, I would
> like to know which patents filed by Xilinx to disclose the contents of
> Slice L.
>
> Slice M is too complex for me to fully understand at the moment and
> just knowledge of Slice L is good enough for me to start with Virtex-5
> as basic knowledge for it.
>
> Thank you.
>
> Weng
Reply by Weng Tianxiang●March 27, 20072007-03-27
Hi,
When I am turning to Xilinx Virtex-5 new chips from Virtex-II, I would
like to know which patents filed by Xilinx to disclose the contents of
Slice L.
Slice M is too complex for me to fully understand at the moment and
just knowledge of Slice L is good enough for me to start with Virtex-5
as basic knowledge for it.
Thank you.
Weng