NEW BOM

68030 + SDRAM + IDE

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PaulJ_2.0
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Re: NEW BOM

Post by PaulJ_2.0 » Mon Oct 05, 2020 1:21 pm

Hanzu wrote:
Mon Oct 05, 2020 12:43 pm
Hi

I thought buffered IDE is always better than unbuffered, so why so many wants unbuffered?

Adding some 74VHC245PW to IC4, IC5 and IC6 and removing some SMD resistor networks is no problem, but it would be nice to know the benefits of each option (Buffered and Ubuffered) before ordering other parts. Almost all pictures of Googled TF536 are are Unbuffered (no IC4, IC5 and IC6). Only one found as buffered.

Also half of the Googled TF536 pictures are without JTAG1 connector and that makes me wonder how do those people program Xilinx?
Buffered IDE is mostly a niche thing. It is for long IDE cables, most people use short CF adapters, so there is no real need for the extra expense and time to install the chips.

You can program the board using pins inserted into the JTAG holes on the board, again, no real need to add something that isn't used.

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GadgetUK164
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Re: NEW BOM

Post by GadgetUK164 » Mon Oct 05, 2020 4:03 pm

The other nice thing with buffered IDE (and primary reason I added it) - it isolates lots of connections from the Xilinx chips.

I killed one of the CPLD's on my TF534 by accidentally connecting an SD to IDE the wrong way around on the IDE connector. That wouldn't happen on the 536 I think. Worst case, buffer chip dies.
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LADmachining
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Re: NEW BOM

Post by LADmachining » Mon Oct 05, 2020 5:14 pm

Hanzu wrote:
Mon Oct 05, 2020 12:52 pm
@exxos Yes I can. External sites edited away.

There is an error on TerribleFire TF53x Accelerator Cards - BoM Spreadsheet row 10 column 8 says "IC CPLD 72MC 10NS 64VQFP" and if you go to Digikey link for example you notice it is "IC CPLD 288MC 10NS 144TQFP"

64 pins compared to 144 pins.
Updated the BoM - description corrected.

Thanks!

Hanzu
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Re: NEW BOM

Post by Hanzu » Mon Oct 26, 2020 1:12 pm

LADmachining wrote:
Mon Oct 05, 2020 5:14 pm
Hanzu wrote:
Mon Oct 05, 2020 12:52 pm
@exxos Yes I can. External sites edited away.

There is an error on TerribleFire TF53x Accelerator Cards - BoM Spreadsheet row 10 column 8 says "IC CPLD 72MC 10NS 64VQFP" and if you go to Digikey link for example you notice it is "IC CPLD 288MC 10NS 144TQFP"

64 pins compared to 144 pins.
Updated the BoM - description corrected.

Thanks!
Thanks, but the BOM table still has a lot of errors in column G (Board ID):

Row 10 is IC3, so row 7 is something else than IC3, I think it is IC2 (silkscreen paiting is tiny and hard to read).

Row 5 is C1 & C2, not C1-C15.

Row 12 is OSC2 not OSC1.

Row 2 quantity is not 2. It is 8 since there are 1206 size capacitors. Not sure if they are all the same type, but they are C3, C6, C8, C9, C16, C17, C18, C24.

Row 30 quantity: I can verify it is 31 and they are all 0603 size. Too tiny to read Board IDs.

LADmachining
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Re: NEW BOM

Post by LADmachining » Thu Oct 29, 2020 4:58 pm

OK, have been through the BoM and updated it according to the latest CSV versions of the parts lists.

Not sure what happened, it should now be right (I hope).

Lynxman
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Re: NEW BOM

Post by Lynxman » Sat Nov 21, 2020 4:36 pm

It woud be nice to be able to order TF536 boards from the shared project part of PCBWay. I worry about making a mistake in the settings if I make the order myself.: https://www.pcbway.com/project/shareproject/

Never mind. It's not open source. I was unaware of the theft that had been going on.

terriblefire
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Re: NEW BOM

Post by terriblefire » Sat Nov 21, 2020 7:16 pm

Lynxman wrote:
Sat Nov 21, 2020 4:36 pm
Never mind. It's not open source. I was unaware of the theft that had been going on.
It never will be open source now. Plus PCBWay make crap boards. full of issues
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stephen_usher
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Re: NEW BOM

Post by stephen_usher » Sat Nov 21, 2020 7:22 pm

terriblefire wrote:
Sat Nov 21, 2020 7:16 pm
Lynxman wrote:
Sat Nov 21, 2020 4:36 pm
Never mind. It's not open source. I was unaware of the theft that had been going on.
It never will be open source now. Plus PCBWay make crap boards. full of issues
Never had a problem with them myself. Every board I've ordered has been completely to specification with the only issues being my own design faults.
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.

terriblefire
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Re: NEW BOM

Post by terriblefire » Sat Nov 21, 2020 7:51 pm

stephen_usher wrote:
Sat Nov 21, 2020 7:22 pm
Never had a problem with them myself. Every board I've ordered has been completely to specification with the only issues being my own design faults.
About 10% of the TF328s i ordered from them had power shorted to ground. No thanks.
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