Connect two DE2 boards via GPIO-Ports

I have connected two DE2 boards via an IDE-cable over the GPIO_0 ports.

I want to use the analog video in from one board to transmit the data (TD_HS, TD_VS, TD_DATA) to the other board.

I tried by just assigning the in-/output ports to the GPIO-ports

On the "slave side":

assign  TD_RESET    =    GPIO_0;//reset to AD-converter
assign  I2C_SCLK    =    GPIO_0;//to AD-converter
assign  I2C_SDAT    =   GPIO_0;//to AD-converter
assign  GPIO_0    =    TD_HS;//to master board
assign  GPIO_0    =    TD_VS;//to master board
assign  GPIO_0=    TD_DATA;//to master board

On the "master side"

assign GPIO_0 = TD_RESET;
assign GPIO_0 = I2C_SCLK;
assign GPIO_0 = I2C_SDAT;
assign TD_HS_slave  = GPIO_0;
assign TD_VS_slave  = GPIO_0;
assign TD_DATA_slave = GPIO_0;

Does the "assign" work for I2C_SDAT, since it is an inout port?

I think that the I2C-Bus of the master-board should be able to drive the AD-converter on the slave-board.

Or might the fact that the AD-converter uses the clock of the slave-board cause problems?

The master board should use the video data and display it to VGA-out. I use the DE2_TV demonstration source, which works fine if I use the analog video-in on the same board.

The reset of the slave-board by resetting the master-board works properly. Since I only map pins I think it should not be an big issue.

But till now I don't get an output on my RGB-out of the master-board.

Anyone here tried something similar before and can give me some hints?