21 May 2018, 06:23 | #1 |
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Location: Victoria, Australia
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DKB Cobra Dead FPGA
I've got a DKB Cobra which has a dead Xilinx XC3130A that I've removed, I haven't programmed an FPGA before so thought I'd see if anyone can help. If I use the install disk from;
http://amiga.resource.cx/exp/cobra will that flash a blank (new) FPGA or will I need to program it before soldering it onto the card? |
21 May 2018, 07:44 | #2 |
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the disk update only eeprom not the xilinx
you need solder old xilinx i have repaired some cobra whit new connector or a washed connector with ultrasong |
21 May 2018, 09:09 | #3 | |
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Location: Helsinki, Finland
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I don't think the Xilinx chip holds the program within itself, what happens is that during boot it will load it from the EEPROM. From the datasheet:
Quote:
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21 May 2018, 09:24 | #4 |
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 49
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FPGA code most likely is in boot ROM flash chip. Every FPGA chip equipped DKB board ROM dump I have seen has few kilobytes of "random" looking data at the end of the ROM image.
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21 May 2018, 12:04 | #5 | |
Digital Corruption
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Quote:
Xilinx XC3000 series chips allow configuration from a Byte wide source, either from address $0000 up, or from $FFFF down: Table 1: Configuration Mode Choices M0 M1 M2 CCLK Mode Data 0 0 0 output Master Bit Serial 0 0 1 output Master Byte Wide Addr. = 0000 up 0 1 1 output Master Byte Wide Addr. = FFFF down 1 0 1 output Peripheral Byte Wide 1 1 1 input Slave Bit Serial From Toni's observation, sounds like it is configured as $FFFF down mode, and initialises the FPGA from the code at the end of the ROM image. Good luck with it Cheers, Red |
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21 May 2018, 13:49 | #6 |
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Brilliant, thanks guys - that's great news! I'll drop a new Xilinx chip on it and hopefully it's all up and running again.
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