Thread View: comp.arch.fpga
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Started by "Arnold Beland"
Mon, 16 Nov 1998 00:00
Is there an alternative to Altera EPM5128 OTP?
Author: "Arnold Beland"
Date: Mon, 16 Nov 1998 00:00
Date: Mon, 16 Nov 1998 00:00
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I have been using Altera's EPM5128 devices since they came out. I am using increasing quantities of them at $55 a pop. Is there a cheaper alternative? Arnold Beland acbel@worldnet.att.net
Re: Is there an alternative to Altera EPM5128 OTP?
Author: "Steve"
Date: Tue, 17 Nov 1998 00:00
Date: Tue, 17 Nov 1998 00:00
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Arnold Beland wrote in message <72rlke$rj@bgtnsc01.worldnet.att.net>... >Color me paranoid, but I prefer to make copying my work at this level >impossible. I sell complete system designs and furnish detailed info on >everything except the fpga's and software. The 7128 should be just as safe as the 5128. Both have security fuses to prevent reading. Both can be programmed in a standalone programmer. The 7128S(A) just have the option of programming in the board. Reading as previously mentioned can be disabled with a security fuse. Steve
Re: Is there an alternative to Altera EPM5128 OTP?
Author: "Arnold Beland"
Date: Tue, 17 Nov 1998 00:00
Date: Tue, 17 Nov 1998 00:00
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Steve wrote in message ... > >The 7128 should be just as safe as the 5128. Both have security fuses >to prevent reading. Both can be programmed in a standalone programmer. >The 7128S(A) just have the option of programming in the board. Reading >as previously mentioned can be disabled with a security fuse. > > >Steve > Thank you, Steve. I guess the 7000 series just past me by. I have been looking at the 9000 series as the next step but they are larger than I need and are pricey. The ISP function has never appealed to me. I have developed the habit of rigorous simulation and design checking. The object is to ship it and forget it and not be afraid to answer my phone. Best Regards, Arnold
Re: Is there an alternative to Altera EPM5128 OTP?
Author: Ray Andraka
Date: Tue, 17 Nov 1998 00:00
Date: Tue, 17 Nov 1998 00:00
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I like ISP, but not because it lets me put a half baked design on the board and try it out. As far as I'm concerned, an hour spent making sure the design will work first time is worth at least 10 in the lab, and I don't care for much for chasing problems in the lab. No, the reason I like ISP, is it gives me more options in debug/integration. For example, you've got a design that interfaces with a system rack through an unusual interface. There are only three systems available, and they are shared between a dozen software guys, a systems guy and five board designers. You are not too popular if you need exclusive access to one of the boxes for days on end to troubleshoot something deep in your hardware. Solution: put the 'unusual interface' in ISP parts. Then for hardware checkout, you can load in an alternate interface to connect to something a little more common...like a PC parallel port. Now you can check out the lion's share of your hardware without hogging a system bucket and without getting stuck with the graveyard shift hours. The trick is to make the alternate interface look the same as the operational one from the board side. Arnold Beland wrote: > Thank you, Steve. I guess the 7000 series just past me by. I have been > looking at the 9000 series as the next step but they are larger than I need > and are pricey. The ISP function has never appealed to me. I have > developed the habit of rigorous simulation and design checking. The object > is to ship it and forget it and not be afraid to answer my phone. -- -Ray Andraka, P.E. President, the Andraka Consulting Group, Inc. 401/884-7930 Fax 401/884-7950 email randraka@ids.net http://users.ids.net/~randraka
Is there an alternative to Altera EPM5128 OTP?
Author: chakanp@hotmail.
Date: Tue, 17 Nov 1998 00:00
Date: Tue, 17 Nov 1998 00:00
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Why don't you use the Altera EPM7128S instead ? 1/3 - of the price, faster and also has the ISP-programming via JTAG pins. The only drawback is that it is not available in the 68pin PLCC, only 84PLCC or 100 TQFP. Since you if you are to use a new part has to do a respin of the PCB you could also try the EPM7128A part, that is the 3.3V version. Best Regards H�kan Pettersson -**** Posted from Supernews, Discussions Start Here(tm) ****- http://www.supernews.com/ - Host to the the World's Discussions & Usenet
Re: Is there an alternative to Altera EPM5128 OTP?
Author: "Arnold Beland"
Date: Tue, 17 Nov 1998 00:00
Date: Tue, 17 Nov 1998 00:00
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Color me paranoid, but I prefer to make copying my work at this level impossible. I sell complete system designs and furnish detailed info on everything except the fpga's and software. Best Regards, Arnold "H�kan Pettersson" wrote in message ... >Why don't you use the Altera EPM7128S instead ? >1/3 - of the price, faster and also has the ISP-programming via JTAG pins. >The only drawback is that it is not available in the 68pin PLCC, only 84PLCC >or 100 TQFP. > >Since you if you are to use a new part has to do a respin of the PCB you >could also try >the EPM7128A part, that is the 3.3V version. > >Best Regards >H�kan Pettersson > > > > -**** Posted from Supernews, Discussions Start Here(tm) ****- >http://www.supernews.com/ - Host to the the World's Discussions & Usenet
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