Hi, We want to make Spartan3AN as One Time Programmable. We want to program it once and then disable JTAG. Is it possible to do that? How can we do that? -- Goli
Is there any way to disable JTAG for Sptantan3AN
Started by ●February 28, 2008
Reply by ●February 29, 20082008-02-29
On 29 Feb., 04:52, Goli <tog...@gmail.com> wrote:> Hi, > > We want to make Spartan3AN as One Time Programmable. We want to > program it once and then disable JTAG. > Is it possible to do that? How can we do that? > > -- > GoliNO
Reply by ●February 29, 20082008-02-29
On Feb 29, 4:52 am, Goli <tog...@gmail.com> wrote:> Hi, > > We want to make Spartan3AN as One Time Programmable. We want to > program it once and then disable JTAG. > Is it possible to do that? How can we do that? > > -- > GoliYou cannot disable the JTAG ! and why do you want to remove the powerful JTAG link from your board application ? One Time Programmable = Not Upgradeable System ! Larry http://www.amontec.com
Reply by ●February 29, 20082008-02-29
ofcourse u can. just ground them! j...@amontec.com schrieb:> On Feb 29, 4:52 am, Goli <tog...@gmail.com> wrote: > > Hi, > > > > We want to make Spartan3AN as One Time Programmable. We want to > > program it once and then disable JTAG. > > Is it possible to do that? How can we do that? > > > > -- > > Goli > > You cannot disable the JTAG ! > > and why do you want to remove the powerful JTAG link from your board > application ? > One Time Programmable = Not Upgradeable System ! > > Larry > http://www.amontec.com
Reply by ●February 29, 20082008-02-29
On 29 Feb., 09:59, waltherz <walther.za...@gmx.de> wrote:> ofcourse u can. just ground them! > > j...@amontec.com schrieb: > > > On Feb 29, 4:52 am, Goli <tog...@gmail.com> wrote: > > > Hi, > > > > We want to make Spartan3AN as One Time Programmable. We want to > > > program it once and then disable JTAG. > > > Is it possible to do that? How can we do that? > > > > -- > > > Goli > > > You cannot disable the JTAG ! > > > and why do you want to remove the powerful JTAG link from your board > > application ? > > One Time Programmable = Not Upgradeable System ! > > > Larry > > http://www.amontec.comthat doesnt prevent the JTAG being used if the chip is desoldered... so it really isnt disabling the JTAG just making it harder to access lso when the S3AN are to be programmed before sending to assembly fab? Antti
Reply by ●March 3, 20082008-03-03
On Feb 29, 2:34 pm, Antti <Antti.Luk...@googlemail.com> wrote:> On 29 Feb., 09:59, waltherz <walther.za...@gmx.de> wrote: > > > > > ofcourse u can. just ground them! > > > j...@amontec.com schrieb: > > > > On Feb 29, 4:52 am, Goli <tog...@gmail.com> wrote: > > > > Hi, > > > > > We want to make Spartan3AN as One Time Programmable. We want to > > > > program it once and then disable JTAG. > > > > Is it possible to do that? How can we do that? > > > > > -- > > > > Goli > > > > You cannot disable the JTAG ! > > > > and why do you want to remove the powerful JTAG link from your board > > > application ? > > > One Time Programmable = Not Upgradeable System ! > > > > Larry > > > http://www.amontec.com > > that doesnt prevent the JTAG being used if the chip is desoldered... > so it really isnt disabling the JTAG just making it harder to access > > lso when the S3AN are to be programmed before sending to assembly fab? > > AnttiI do agree that there are ways on board with which you can make it very difficult for other people to use JTAG. But I was wondering if there is any solution to make the FPGAs as OTP (One time Programmable). I think for Spartan XL FPGAs we used to get OTP Proms. So was wondering if there is any similar solution for Spartan3AN. -- Goli
Reply by ●March 3, 20082008-03-03
On 3 Mrz., 05:48, Goli <tog...@gmail.com> wrote:> On Feb 29, 2:34 pm, Antti <Antti.Luk...@googlemail.com> wrote: > > > > > On 29 Feb., 09:59, waltherz <walther.za...@gmx.de> wrote: > > > > ofcourse u can. just ground them! > > > > j...@amontec.com schrieb: > > > > > On Feb 29, 4:52 am, Goli <tog...@gmail.com> wrote: > > > > > Hi, > > > > > > We want to make Spartan3AN as One Time Programmable. We want to > > > > > program it once and then disable JTAG. > > > > > Is it possible to do that? How can we do that? > > > > > > -- > > > > > Goli > > > > > You cannot disable the JTAG ! > > > > > and why do you want to remove the powerful JTAG link from your board > > > > application ? > > > > One Time Programmable = Not Upgradeable System ! > > > > > Larry > > > > http://www.amontec.com > > > that doesnt prevent the JTAG being used if the chip is desoldered... > > so it really isnt disabling the JTAG just making it harder to access > > > lso when the S3AN are to be programmed before sending to assembly fab? > > > Antti > > I do agree that there are ways on board with which you can make it > very difficult for other people to use JTAG. But I was wondering if > there is any solution to make the FPGAs as OTP (One time > Programmable). I think for Spartan XL FPGAs we used to get OTP Proms. > So was wondering if there is any similar solution for Spartan3AN. > > -- > Golithe internal FLASH of S3AN does have OTP write protect fuse. so if you set that protection then the S3AN internal memory comes read only but it will not prevent configuration by other means Antti
Reply by ●March 3, 20082008-03-03
On 3 mrt, 07:27, Antti <Antti.Luk...@googlemail.com> wrote:> On 3 Mrz., 05:48, Goli <tog...@gmail.com> wrote: > > > > > > > On Feb 29, 2:34 pm, Antti <Antti.Luk...@googlemail.com> wrote: > > > > On 29 Feb., 09:59, waltherz <walther.za...@gmx.de> wrote: > > > > > ofcourse u can. just ground them! > > > > > j...@amontec.com schrieb: > > > > > > On Feb 29, 4:52 am, Goli <tog...@gmail.com> wrote: > > > > > > Hi, > > > > > > > We want to make Spartan3AN as One Time Programmable. We want to > > > > > > program it once and then disable JTAG. > > > > > > Is it possible to do that? How can we do that? > > > > > > > -- > > > > > > Goli > > > > > > You cannot disable the JTAG ! > > > > > > and why do you want to remove the powerful JTAG link from your boa=rd> > > > > application ? > > > > > One Time Programmable =3D Not Upgradeable System ! > > > > > > Larry > > > > > =A0http://www.amontec.com > > > > that doesnt prevent the JTAG being used if the chip is desoldered... > > > so it really isnt disabling the JTAG just making it harder to access > > > > lso when the S3AN are to be programmed before sending to assembly fab?=> > > > Antti > > > I do agree that there are ways on board with which you can make it > > very difficult for other people to use JTAG. But I was wondering if > > there is any solution to make the FPGAs as OTP (One time > > Programmable). I think for Spartan XL FPGAs we used to get OTP Proms. > > So was wondering if there is any similar solution for Spartan3AN. > > > -- > > Goli > > the internal FLASH of S3AN does have OTP write protect fuse. > so if you set that protection then the S3AN internal memory comes read > only > but it will not prevent configuration by other means > > Antti- Tekst uit oorspronkelijk bericht niet weergeven - > > - Tekst uit oorspronkelijk bericht weergeven -Hi, If design security is an issue consider Actel iso. Xilinx Spartan or other Xilinx devices with AES protection .... Bert.
Reply by ●March 3, 20082008-03-03
On 3 Mrz., 11:54, Bert <bert.maar...@nl.thalesgroup.com> wrote:> On 3 mrt, 07:27, Antti <Antti.Luk...@googlemail.com> wrote: > > > > > On 3 Mrz., 05:48, Goli <tog...@gmail.com> wrote: > > > > On Feb 29, 2:34 pm, Antti <Antti.Luk...@googlemail.com> wrote: > > > > > On 29 Feb., 09:59, waltherz <walther.za...@gmx.de> wrote: > > > > > > ofcourse u can. just ground them! > > > > > > j...@amontec.com schrieb: > > > > > > > On Feb 29, 4:52 am, Goli <tog...@gmail.com> wrote: > > > > > > > Hi, > > > > > > > > We want to make Spartan3AN as One Time Programmable. We want to > > > > > > > program it once and then disable JTAG. > > > > > > > Is it possible to do that? How can we do that? > > > > > > > > -- > > > > > > > Goli > > > > > > > You cannot disable the JTAG ! > > > > > > > and why do you want to remove the powerful JTAG link from your board > > > > > > application ? > > > > > > One Time Programmable = Not Upgradeable System ! > > > > > > > Larry > > > > > > http://www.amontec.com > > > > > that doesnt prevent the JTAG being used if the chip is desoldered... > > > > so it really isnt disabling the JTAG just making it harder to access > > > > > lso when the S3AN are to be programmed before sending to assembly fab? > > > > > Antti > > > > I do agree that there are ways on board with which you can make it > > > very difficult for other people to use JTAG. But I was wondering if > > > there is any solution to make the FPGAs as OTP (One time > > > Programmable). I think for Spartan XL FPGAs we used to get OTP Proms. > > > So was wondering if there is any similar solution for Spartan3AN. > > > > -- > > > Goli > > > the internal FLASH of S3AN does have OTP write protect fuse. > > so if you set that protection then the S3AN internal memory comes read > > only > > but it will not prevent configuration by other means > > > Antti- Tekst uit oorspronkelijk bericht niet weergeven - > > > - Tekst uit oorspronkelijk bericht weergeven - > > Hi, > > If design security is an issue consider Actel iso. Xilinx Spartan or > other Xilinx devices with AES protection .... > > Bert.Bert, 1) Design change from Xilinx to Actel may cause many man-months of struggle. 2) Field updates of Actel FPGA are only secure for non M7/M1 devices. Any design that updates on field Actel M7/M1 silicon has design theft security equal to NIL VOID ZERO 3) Lattice ECP2 have non-volatile AES key, making them best candidate if design security/theft is of concern, also the design migration from Xilinx to Lattice is much much more easier then Xilinx to Actel Antti
Reply by ●March 4, 20082008-03-04
Antti <Antti.Lukats@googlemail.com> writes:> 3) Lattice ECP2 have non-volatile AES key, making them best candidate > if design security/theft is of concern, also the design migration from > Xilinx to Lattice is much much more easier then Xilinx to ActelIf it's non-volatile, is it not "relatively easy" to extract the key from the chip by invasive methods? I say "relatively", compared to the volatile keys in a virtex device - still not a trivial task :-) Cheers, Martin -- martin.j.thompson@trw.com TRW Conekt - Consultancy in Engineering, Knowledge and Technology http://www.conekt.net/electronics.html
