Lists of devices
Appears to be a rebadged Adhoc Technologies AH101. This is apparently an OEM part with very little discussion in the literature, see http://scripts.online.ru/it/news/engnews/98/11/23_009.htm.
Seems to be a 3-metal ~350nm process.
Mask revision labels
Overview of upper right corner of die, showing power busing and part of the PHY.
Buffer memory and some logic.
Lower left corner. Small memory array (EEPROM maybe?) and logic.
Close up of cell array.