Motivated by the research above, I thought I might test out my JTagulator on an SD card.
This particular card is a 2GB Sony Class 4. The controller appears to be made by Phison, a PS2233 or something close. The NAND ID is 0x98 0xD5 0x94 0x32 and the part number is likely HVPE4F4. I have seen the manufacturer of these to be listed in vatious places as both Toshiba and Hynix, and also Samsung. I don't know which it is.
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I noticed that after the coating was removed, there were 2 sets of traces leading to the edge of the card. I was thinking test point or programming points.
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I decided to start with the smaller set, 4 traces. I soldered some thin wires under the microscope to the pads that were not used for the NAND Flash chip.
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The wires were too fragile so I made up a board to hold it, and also extension made from a sd-microsd adapter so I could insert it in my laptop still while analysing.
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Here is the whole setup.
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I will post details of what signals I find soon, I didn't realise the time until the birds started singing.. dang, another day feeling tired coming up