256Mbit (32Mx8bit / 16Mx16bit) NAND Flash Memory
Decoding the part number suggests that the device is SLC, single die, 3.3V supply, 32Mx8.
Datasheet first rev is 2003 so die design is probably about this age too. 90 nm ish? No deprocessing performed so not sure of exact node. Date code on the package is 2005 week 7.
Package
Markings:
hynix KOR HY27US08561M TPEB 507B M9RB1508?
Last line is in a different font and last character is unreadable. Firmware revision code maybe?
Die
Size is large (not measured, full images not acquired yet)
Overview of bottom part of die
Closeup of die ID markings
Various parts of memory array (images do not overlap)
Various closeups
Random logic at bottom center of chip. Lots of CMP filler (?)
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