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256Mbit (32Mx8bit / 16Mx16bit) NAND Flash Memory

Decoding the part number suggests that the device SLC, single die, 3.3V supply, 32Mx8.

Datasheet first rev is 2003 so die design is probably about this age too. 90 nm ish? 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 (?)