Is the silkscreen wrong on the power connector?

68030 + SDRAM + IDE

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derkom
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Is the silkscreen wrong on the power connector?

Post by derkom » Tue Jun 30, 2020 10:24 pm

Is the PWR2 connector on the TF536 labelled backwards?
The pin labelled GND definitely appears to be connected to VCC on the 68k, and +5V is connected to the ground plane on the board.
Possibly this problem was referenced here?


Edit: Text kept for posterity and appropriate levels of embarrassment for myself. Do not pay any attention to this. I was wrong. Silkscreen is correct.

terriblefire
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Re: Is the silkscreen wrong on the power connector?

Post by terriblefire » Tue Jun 30, 2020 10:37 pm

Very probably.

Dont trust my silkscreens.
———
I get cranky when asked to repeat myself.

PaulJ_2.0
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Re: Is the silkscreen wrong on the power connector?

Post by PaulJ_2.0 » Wed Jul 01, 2020 12:32 am

Silkscreen is fine. I program the CPLDs with that polarity, so it must be correct.

go0se
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Re: Is the silkscreen wrong on the power connector?

Post by go0se » Wed Jul 01, 2020 1:47 am

The power labels on the 536 rev2b are correct, TF fixed this on an earlier revision. The image is deceiving as +5V looks like it is surrounded by GND but is actually connected to an internal power layer. The +5V on the 68K is connected to GND via a decoupling/smoothing capacitor, not directly.

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derkom
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Re: Is the silkscreen wrong on the power connector?

Post by derkom » Wed Jul 01, 2020 6:58 am

go0se wrote:
Wed Jul 01, 2020 1:47 am
The power labels on the 536 rev2b are correct, TF fixed this on an earlier revision. The image is deceiving as +5V looks like it is surrounded by GND but is actually connected to an internal power layer. The +5V on the 68K is connected to GND via a decoupling/smoothing capacitor, not directly.
Oh gosh, this is why I shouldn't work too late at night. :blonde: Of course that is a decoupling cap, and for some reason I just didn't realise it last night.

Apologies to all. :oops: Nobody listen to this thread and accidentally hook it up backwards. :lol:

PaulJ_2.0
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Re: Is the silkscreen wrong on the power connector?

Post by PaulJ_2.0 » Wed Jul 01, 2020 8:25 am

derkom wrote:
Wed Jul 01, 2020 6:58 am
Apologies to all. :oops: Nobody listen to this thread and accidentally hook it up backwards. :lol:
No worries there Pal, there isn't one of us that hasn't popped a board with the wrong polarity :)

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