DDC for LCD display

Hi,

I Have connected a NEC LCD display 640x480 pixels to the dvi bus via
a TI DVI receiver.
Works great.
Except the cPCI board always seems to be using the largest resolution.
So I only see a part of the screen.

There is no DDC eeprom on the board.
I suppose I need to add one with the right configuration to get the cPCI
board in the right resolution.
Is simple I2C eeprom.

But the info in it seems to be very secret.
Can anyone help me with the memory map for the eeprom.
Just need it for 640*480 60Hz.


Thanks,

Jef