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Messages from 26875

Article: 26875
Subject: cryptography/Block ciphers
From: "ajd" <dullrabbit@hotmail.com>
Date: Thu, 2 Nov 2000 12:43:34 -0000
Links: << >>  << T >>  << A >>
Hi,

Is anyone writing any cryptographic algorithms or block ciphers on an FPGA.
I'm interested as to what sort of throughput to aim for on my Xilinx
Virtex1000 -4.

thanks
Andrew




Article: 26876
Subject: Block Ram
From: chsw <chen.songwei@mail.zte.com.cn>
Date: Thu, 2 Nov 2000 06:00:14 -0700
Links: << >>  << T >>  << A >>
hello: when i am doing timing simulator(using the reference design xapp205.zip :fifoctlr_ccmw1.v/fifoctlr_ccmw2.v) for a project,the follwoing message occures: "P1/U1/U11/BU0/INTERNAL_BLOCKRAM--READ Violation.Attempt to read from cell that is also being written to." the capacity of the dual block ram i mentioned is 16x1024--64x256,that is,when read_enable is active,write_enable must inactive.But when i replace it with 16x2048---64x512,it is right,and the phenomena of the warning is not . why?

Article: 26877
Subject: Re: Excellent Opportunity ASIC Engineers CA International Relocation
From: Jerry English <jenglish@planetc.com>
Date: Thu, 02 Nov 2000 08:29:54 -0500
Links: << >>  << T >>  << A >>


Atlas wrote:

And I snipped it.

Why don't you pay a few dollars and post it on www.monster.com?

Oh, Peter, good call on the grammer hack job.
With that said I hope my grammer is accetable (:>)

regards
Jerry


Article: 26878
Subject: Pwer supply for a XCV300. Recommendations please.
From: "Dan" <daniel.deconinck@sympatico.ca>
Date: Thu, 02 Nov 2000 14:48:38 GMT
Links: << >>  << T >>  << A >>
Hello,

The XCV300 needs 2.5V and 3.3V.

The supply on the PCB is 5V.

Will a voltage regulator do the job or do I need a DC/DC convertor?

I have never designed with a DC/DC. Which should I use (if this is the way
to go) ?

Dan




Article: 26879
Subject: Re: Pwer supply for a XCV300. Recommendations please.
From: Gunnar Tufte <gunnart@idi.ntnu.no>
Date: Thu, 02 Nov 2000 15:58:28 +0100
Links: << >>  << T >>  << A >>
Hi

You can use a LM317 voltage rerulator (1.5A). The LM317 have a output voltage
range from 1.2V to 37V (1% voltage tolerance)..

Gunnar

Dan wrote:

> Hello,
>
> The XCV300 needs 2.5V and 3.3V.
>
> The supply on the PCB is 5V.
>
> Will a voltage regulator do the job or do I need a DC/DC convertor?
>
> I have never designed with a DC/DC. Which should I use (if this is the way
> to go) ?
>
> Dan


Article: 26880
Subject: ISO C -> VHDL translator, prefer open source
From: "Peter Dennett" <pdennett@padsoft.com>
Date: Thu, 2 Nov 2000 09:34:23 -0600
Links: << >>  << T >>  << A >>
Is there any GNU or like open source system for conversion of
C to VHDL?  Or for that matter any other higher level language.

I'm a programmer interested in learning a bit about FPGAs
and was thinking this might be a good way to get my feet
wet.  I don't need, nor could I afford a commercial product,
unless its real affordable.

As a starter project I am interested in creating a simple graphic
LCD controller for quarter VGA devices.  Nothing fancy, just
handle screen refresh from a SRAM, simple dot, line drawing,
and bit blit algorithms to SRAM, and a microcontroller interface.
Initially monochrome, but room to grow to color.

Likely I'll be using a "student" version for the FPGA tools.  I
have not as yet chosen a chip vendor of choice.

Any constructive suggestions (I already know I'm a snot nosed
programmer walking among the hardware gods)  to either the
converter, project, or appropriate chips are welcome.

--
Peter Dennett                     Email: pdennett@padsoft.com
61 Harbor Lane                  Web:  www.padsoft.com
Kemah, TX 77565               Web: www.boatbrains.com
Voice: 281 334 3800         Cell: 713 899 6100       Fax: 281 521 1032



Article: 26881
Subject: OT: Xilinx T-Shirt
From: "James S." <ads@begone.com>
Date: 2 Nov 2000 10:17:10 -0600
Links: << >>  << T >>  << A >>
A few months ago Xilinx had a survey up on their website for their software
users, and they said that if you filled it out, you would get a free
t-shirt.  I filled out that survey but never got the shirt.  Did anybody
else?  I enjoy using Xilinx's products and would love to get a t-shirt.



Article: 26882
Subject: Re: OT: Xilinx T-Shirt
From: Andy Peters <"apeters <"@> n o a o [.] e d u>
Date: Thu, 02 Nov 2000 09:38:31 -0700
Links: << >>  << T >>  << A >>
"James S." wrote:
> 
> A few months ago Xilinx had a survey up on their website for their software
> users, and they said that if you filled it out, you would get a free
> t-shirt.  I filled out that survey but never got the shirt.  Did anybody
> else?  I enjoy using Xilinx's products and would love to get a t-shirt.

I didn't get one, and we actually pay for the software.  IDT never sent
me the coffee mug (or was that a t-shirt?)  they promised to send if I
filled out a form.

Hey, Xilinx, why don'tcha look at your registered paid-in-full users
list and send us all a nice early Hanukkah present?  I wear large
t-shirts, drink black coffee and stout (tho' not at the same time) and
have no use for planners, note-pads or posters.  ModelTech should do the
same.  Address is below.  Keep the CD-ROMs, I have enough.

For the amount of money these vendors charge, swag oughta be included. 
That will save me the hassle of going to trade shows.  I did, however,
get a very nice Analog Devices ball-cap at the AES show.  The Shure cap
is nice, too.  The best bit of swag was a Fairchild 660 limiter
refrigerator magnet from the Bomb Factory, who do ProTools plug-ins.

-- a
----------------------------
Andy Peters
Sr. Electrical Engineer
National Optical Astronomy Observatory
950 N Cherry Ave
Tucson, AZ 85719
apeters (at) n o a o [dot] e d u

"It is better to be silent and thought a fool, 
 than to send an e-mail to the entire company
 and remove all doubt."

Article: 26883
Subject: Re: OT: Xilinx T-Shirt
From: buchty@nina.hotswap (Rainer Buchty)
Date: 2 Nov 2000 16:42:14 GMT
Links: << >>  << T >>  << A >>
In article <3a0192f8$0$32688$45beb828@newscene.com>,
 "James S." <ads@begone.com> writes:
|> A few months ago Xilinx had a survey up on their website for their software
|> users, and they said that if you filled it out, you would get a free
|> t-shirt.  I filled out that survey but never got the shirt.  Did anybody
|> else?  I enjoy using Xilinx's products and would love to get a t-shirt.

I received one...

Regards,
	Rainer

-- 

Rainer Buchty, LRR, Munich University of Technology, Germany
Phone: +49 89 289-25770, Fax +49 89 289-28232, Room S3240

Article: 26884
Subject: Re: Block Ram
From: Mujtaba Hamid <mujtaba.hamid@xilinx.com>
Date: Thu, 02 Nov 2000 09:46:33 -0700
Links: << >>  << T >>  << A >>
Hello,

        You should be seeing a warning everytime you try to read from, and write to, the same memory location at the same time. If you are not seeing this warning , i would suggest contacting Xilinx technical support.

Regards,
Mujtaba
Xilinx Applications

chsw wrote:

> hello: when i am doing timing simulator(using the reference design xapp205.zip :fifoctlr_ccmw1.v/fifoctlr_ccmw2.v) for a project,the follwoing message occures: "P1/U1/U11/BU0/INTERNAL_BLOCKRAM--READ Violation.Attempt to read from cell that is also being written to." the capacity of the dual block ram i mentioned is 16x1024--64x256,that is,when read_enable is active,write_enable must inactive.But when i replace it with 16x2048---64x512,it is right,and the phenomena of the warning is not . why?


Article: 26885
Subject: Need a PCB speaker driven by XCV100
From: "Dan" <daniel.deconinck@sympatico.ca>
Date: Thu, 02 Nov 2000 16:55:16 GMT
Links: << >>  << T >>  << A >>
I want to generate a given frequency 40HZ to 5KHZ with counters and output
this to a speaker mounted on a PCB.

LowQuality is accepatble.
Power enough to be heard by human from 10 feet.

Please recommend a speaker and interface for FPGA.

Thanks
Dan



Article: 26886
Subject: Re: cryptography/Block ciphers
From: nweaver@soda.CSUA.Berkeley.EDU (Nicholas Weaver)
Date: 2 Nov 2000 17:02:27 GMT
Links: << >>  << T >>  << A >>
In article <3a016161@news2lo.highwayone.net>,
ajd <dullrabbit@hotmail.com> wrote:
>Hi,
>
>Is anyone writing any cryptographic algorithms or block ciphers on an FPGA.
>I'm interested as to what sort of throughput to aim for on my Xilinx
>Virtex1000 -4.

	Which mode of operation?  Often, the mode of operation is the
big limiter on throughput.  IF you are careful about it, use counter
mode as it parallelizes arbitrarily well.

	And which algorithm?  IT varies alot.  And there is a huge
tradeoff space between area and performance which can be exploited.
Are you doing subkey generation in hardware?  How much of the virtex
do you actually want to use?

	In terms of algorithms to implement, I'd look at Rijndael (the
AES winner) and 3DES.  Both are solid, high quality algorithms, which
can be efficiently implemented.
-- 
Nicholas C. Weaver                                 nweaver@cs.berkeley.edu

Article: 26887
Subject: Re: OT: Xilinx T-Shirt
From: "fred" <x@y.z>
Date: Thu, 2 Nov 2000 17:12:41 -0000
Links: << >>  << T >>  << A >>
You're hooked matey, they don't need to butter you up.

Me also.

Dave



Article: 26888
Subject: clock multiplication and Spartan2 DLL placement constraints
From: Nicolas Matringe <nicolas.matringe@IPricot.com>
Date: Thu, 02 Nov 2000 18:13:49 +0100
Links: << >>  << T >>  << A >>
Hi all
I am trying to implement a 4x clock multiplier using two DLLs in a
Spartan2. I need to clock a part of the chip 4x faster than the rest.
My problem is that the placer complains because it cannot place the DLLs
and the BUFGs on the same edge of the chip (I need 3 BUFGs).
I tried to constrain the placement but it doesn't work. What's wrong
with my constraints?

INST dll LOC = DLL2;
INST dll2 LOC = DLL0;

-- 
Nicolas MATRINGE           IPricot European Headquarters
Conception electronique    16 rue du Moulin des Bruyeres
Tel +33 1 46 67 51 11      F-92400 COURBEVOIE - FRANCE
Fax +33 1 46 67 51 01      http://www.IPricot.com/

Article: 26889
Subject: Re: clock multiplication and Spartan2 DLL placement constraints
From: Steven Derrien <sderrien@irisa.fr>
Date: Thu, 02 Nov 2000 18:25:00 +0100
Links: << >>  << T >>  << A >>


Nicolas Matringe wrote:
> 
> Hi all
> I am trying to implement a 4x clock multiplier using two DLLs in a
> Spartan2. I need to clock a part of the chip 4x faster than the rest.
> My problem is that the placer complains because it cannot place the DLLs
> and the BUFGs on the same edge of the chip (I need 3 BUFGs).
> I tried to constrain the placement but it doesn't work. What's wrong
> with my constraints?
> 
> INST dll LOC = DLL2;
> INST dll2 LOC = DLL0;

If you're using M2.1, there is a bug in the mapper regarding the DLL
placement contraints, this problem is (accoridng the xilinx website)
adressed in M3.1. 
otherwis a workaround is provided in "Xilinx answer #6624" at
support.xilinx.com (use keyword +dll +virtex +map)

Steven


> 
> --
> Nicolas MATRINGE           IPricot European Headquarters
> Conception electronique    16 rue du Moulin des Bruyeres
> Tel +33 1 46 67 51 11      F-92400 COURBEVOIE - FRANCE
> Fax +33 1 46 67 51 01      http://www.IPricot.com/

Article: 26890
Subject: Re: OT: Xilinx T-Shirt
From: Greg Neff <gregneff@my-deja.com>
Date: Thu, 02 Nov 2000 17:39:13 GMT
Links: << >>  << T >>  << A >>
In article <3a0192f8$0$32688$45beb828@newscene.com>,
  "James S." <ads@begone.com> wrote:
(snip)
>  I filled out that survey but never got the shirt.
(snip)

That's what happens when you click on the "Spartan" check box...

--
Greg Neff
VP Engineering
*Microsym* Computers Inc.
greg@guesswhichwordgoeshere.com


Sent via Deja.com http://www.deja.com/
Before you buy.

Article: 26891
Subject: Re: clock multiplication and Spartan2 DLL placement constraints
From: Nicolas Matringe <nicolas.matringe@IPricot.com>
Date: Thu, 02 Nov 2000 18:45:49 +0100
Links: << >>  << T >>  << A >>
Steven Derrien a écrit :
> 
> If you're using M2.1, there is a bug in the mapper regarding the DLL
> placement contraints, this problem is (accoridng the xilinx website)
> adressed in M3.1.
> otherwis a workaround is provided in "Xilinx answer #6624" at
> support.xilinx.com (use keyword +dll +virtex +map)

Great! I'm precisely using M2.1i
I'll try right away.
Thanks a lot
-- 
Nicolas MATRINGE           IPricot European Headquarters
Conception electronique    16 rue du Moulin des Bruyeres
Tel +33 1 46 67 51 11      F-92400 COURBEVOIE - FRANCE
Fax +33 1 46 67 51 01      http://www.IPricot.com/

Article: 26892
Subject: Re: clock multiplication and Spartan2 DLL placement constraints
From: Nicolas Matringe <nicolas.matringe@IPricot.com>
Date: Thu, 02 Nov 2000 18:50:55 +0100
Links: << >>  << T >>  << A >>
Steven Derrien a écrit :

> If you're using M2.1, there is a bug in the mapper regarding the DLL
> placement contraints, this problem is (accoridng the xilinx website)
> adressed in M3.1.
> otherwis a workaround is provided in "Xilinx answer #6624" at
> support.xilinx.com (use keyword +dll +virtex +map)

That's not the right answer: my problems comes from the placer, not the
mapper.
I found the correct answer (searching +dll +virtex +par) there:
Xilinx Answer #6984: 2.1i Virtex PAR - PAR is failing to allow 2 DLL
design with 3 BUFGs to complete.

-- 
Nicolas MATRINGE           IPricot European Headquarters
Conception electronique    16 rue du Moulin des Bruyeres
Tel +33 1 46 67 51 11      F-92400 COURBEVOIE - FRANCE
Fax +33 1 46 67 51 01      http://www.IPricot.com/

Article: 26893
Subject: Re: Need a PCB speaker driven by XCV100
From: Peter Alfke <peter.alfke@xilinx.com>
Date: Thu, 02 Nov 2000 09:59:08 -0800
Links: << >>  << T >>  << A >>
The output voltage ( 3.3 V?) may be rather low, so I would drive the speaker
in push-pull from two outputs that are in counter-phase.

Peter Alfke

Dan wrote:

> I want to generate a given frequency 40HZ to 5KHZ with counters and output
> this to a speaker mounted on a PCB.
>
> LowQuality is accepatble.
> Power enough to be heard by human from 10 feet.
>
> Please recommend a speaker and interface for FPGA.
>
> Thanks
> Dan


Article: 26894
Subject: Re: Pwer supply for a XCV300. Recommendations please.
From: David Forbes <dforbes@azspamnet.com>
Date: Thu, 02 Nov 2000 12:40:20 -0700
Links: << >>  << T >>  << A >>
Danger! Don't use an LM317, as it is not a low-dropout regulator. It 
will not work with a 5V input!

I recommend the Linear Technology LT1117 for a good general-purpose 1 
Amp or so 5V -> 3.3V or ->2.5V linear regulator. It will need a heat 
sink (at least some copper PC board real estate) if you need an amp or 
more of current.

If you need less current than an amp, there are smaller parts from 
Linear Tech, Maxim, National, Micrel, etc. that will do the job. 

These companies also make DC-DC switching controllers, some with 
built-in switches and some without. They are generally very easy to use 
these days!


In article <3A018114.5518EEAB@idi.ntnu.no>, Gunnar Tufte 
<gunnart@idi.ntnu.no> wrote:

> Hi
> 
> You can use a LM317 voltage rerulator (1.5A). The LM317 have a output 
> voltage
> range from 1.2V to 37V (1% voltage tolerance)..
> 
> Gunnar
> 
> Dan wrote:
> 
> > Hello,
> >
> > The XCV300 needs 2.5V and 3.3V.
> >
> > The supply on the PCB is 5V.
> >
> > Will a voltage regulator do the job or do I need a DC/DC convertor?
> >
> > I have never designed with a DC/DC. Which should I use (if this is the 
> > way
> > to go) ?
> >
> > Dan
>

--David Forbes
Tucson AZ

Change spamnet to starnet before replying.

Article: 26895
Subject: Re: OT: Xilinx T-Shirt
From: eml@riverside-machines.com.NOSPAM
Date: Thu, 02 Nov 2000 19:57:56 GMT
Links: << >>  << T >>  << A >>
On 2 Nov 2000 10:17:10 -0600, "James S." <ads@begone.com> wrote:

>A few months ago Xilinx had a survey up on their website for their software
>users, and they said that if you filled it out, you would get a free
>t-shirt.  I filled out that survey but never got the shirt.  Did anybody
>else?  I enjoy using Xilinx's products and would love to get a t-shirt.

A few months ago, a US cable company broadcast a high-profile boxing
match. During one of the breaks, they ran a commercial offering a free
T-shirt for the viewers. However, the cable company deliberately
rigged it so that the signal was scrambled during the ad, so even the
pay-per-view subscribers couldn't see it.

Why? Answer tomorrow if no-one gets it...

Evan

Article: 26896
Subject: Re: OT: Xilinx T-Shirt
From: Eric Smith <eric-no-spam-for-me@brouhaha.com>
Date: 02 Nov 2000 12:36:53 -0800
Links: << >>  << T >>  << A >>
eml@riverside-machines.com.NOSPAM writes:
> A few months ago, a US cable company broadcast a high-profile boxing
> match. During one of the breaks, they ran a commercial offering a free
> T-shirt for the viewers. However, the cable company deliberately
> rigged it so that the signal was scrambled during the ad, so even the
> pay-per-view subscribers couldn't see it.
> 
> Why? Answer tomorrow if no-one gets it...

Clever of them, but it doesn't explain why Xilinx didn't send the
promised T-shirts.

Article: 26897
Subject: Re: OT: Xilinx T-Shirt
From: Jerry English <jenglish@planetc.com>
Date: Thu, 02 Nov 2000 16:45:48 -0500
Links: << >>  << T >>  << A >>
Yeah, now I think I remember filling out that form. Never did get that T-shirt,

and I use Lucents Orca devices. Did get a t-shirt from Chip Express after
filling out a survey form.

"James S." wrote:

> A few months ago Xilinx had a survey up on their website for their software
> users, and they said that if you filled it out, you would get a free
> t-shirt.  I filled out that survey but never got the shirt.  Did anybody
> else?  I enjoy using Xilinx's products and would love to get a t-shirt.


Article: 26898
Subject: Re: OT: Xilinx T-Shirt
From: Richard Chidester <richardc@xilinx.com>
Date: Thu, 02 Nov 2000 15:34:44 -0700
Links: << >>  << T >>  << A >>
This is a multi-part message in MIME format.
--------------53A37488ED713025FC344172
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

Gentlemen,

Due to some difficulties, the shirts were held up in manufacturing!  We have
them in stock now and we will start shipping.

Best regards,
Richard Chidester



"James S." wrote:

> A few months ago Xilinx had a survey up on their website for their software
> users, and they said that if you filled it out, you would get a free
> t-shirt.  I filled out that survey but never got the shirt.  Did anybody
> else?  I enjoy using Xilinx's products and would love to get a t-shirt.

--------------53A37488ED713025FC344172
Content-Type: text/x-vcard; charset=us-ascii;
 name="richardc.vcf"
Content-Transfer-Encoding: 7bit
Content-Description: Card for Richard Chidester
Content-Disposition: attachment;
 filename="richardc.vcf"

begin:vcard 
n:Chidester;Richard
tel;fax:303-442-9124
tel;work:303-544-5558
x-mozilla-html:TRUE
org:CPLD Software Group;Xilinx, Inc.     <br><img SRC="http://www.xilinx.com/sxpresso/images/webpack_ise_logo.jpg" height=70 width=104><font size=-1><a href=""></a> "The empires of the future are the empires of the mind." <BR><CENTER><I>  ... Winston Churchill</I></font></CENTER>
adr:;;2300 55th Street;Boulder;Colorado;80301;USA
version:2.1
email;internet:richardc@xilinx.com
title:Sr. Technical Marketing Engineer
note;quoted-printable:<br><img SRC=3D"http://webster/images/button.gif" height=3D74 width=3D184><font size=3D-1><a href=3D""></a>"    Yeah.  Free my mind.  Right.  No problem.=0D=0A   "  <BR><CENTER><I>   ...  (Neo -  in The Matrix)</I>=0D=0A</font></CENTER> 
fn:Richard Chidester
end:vcard

--------------53A37488ED713025FC344172--


Article: 26899
Subject: Re: Xilinx T-Shirt
From: "S. Ramirez" <sramirez@deleet.cfl.rr.com>
Date: Thu, 02 Nov 2000 22:35:08 GMT
Links: << >>  << T >>  << A >>
James, could it be that it was determined in the survey that you are a
software and silicon user, not just a software user?
If you are just a software user, then you are in the minority.
-Simon Ramire, Consultant
 Synchronous Design, Inc.



"James S." <ads@begone.com> wrote in message
news:3a0192f8$0$32688$45beb828@newscene.com...
> A few months ago Xilinx had a survey up on their website for their
software
> users, and they said that if you filled it out, you would get a free
> t-shirt.  I filled out that survey but never got the shirt.  Did anybody
> else?  I enjoy using Xilinx's products and would love to get a t-shirt.
>
>
>





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