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New board JTAG error

Hello every one, We have designed a board which contains an ALTERA fpga and an EPROM(EPC2LC20).The design is done with respect to some existing reference schematics.We have populated our PCB so as to get the power to all the components and then we have placed the components making up the JTAG circuitary along with the FPGA and EPROM. ,Altera's Byte blaster is being used which is working fine. have checked all the circuitary which seems to be alright but we keep getting the error"Unable to access the JTAG chain".We have also tried the steps in the ALTERAs trouble shooters. Do we need to proceed in a different way while programming the chip/EPROM for the first time.And also what is the passive serial mode in the Quartus tool for programming. Any help would be highly appreciated.Thanks in advance.

Reply to
mailsatishv
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Hello.. Satish? Please tell us what voltage your FPGA's JTAG port is configured for. Does your Byte Blaster have a voltage range that's compatible with this chain? The programmers have been around in various forms for ages; if you're using an old programmer, it may not be compatible (or may require special tweaks) to interface properly. ,As far as programming using the passive serial mode, have you read up on the (most probably) abundant literature that focuses explicitly on configuration? Because *all* designs need to be configured, *all* the engineers need to understand how to work in their mode. Do you have more than just the Altera FPGA and EPROM on board? Do you have a processor that can store the configuration file and bit-bang some FPGA pins through the processor GPIO? If so, you have all the access you need for the passive serial configuration; it's just a matter of reading up on how to do what when.

Good luck,

- John_H

Reply to
John_H

Thank you John. The voltages are configured for

3.3V.All the circuitry seems to be O.k. The download cable does support the FLEX device.With a similar board we are able to detect the devices through this cable.
Reply to
mailsatishv

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