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MPC8306 DDR2 Data conection in MPC8603 SOM

Question asked by Manuel Ojea on Mar 11, 2014
Latest reply on Mar 12, 2014 by Manuel Ojea

We are developing a processor board with the MPC8306. We need to use the DDR2 controller to conect the MPC8306 with a 128MB DDR2 Memory (MT47H128M16 from Micron).

 

We buy a MPC8306 Evaluation board to start de SW development and to use it as refernce design.

 

We found that the connection between the MPC8306 and the DDR2 memory has a strange way to connect the data bus of the ddr2.

 

The data bit 0 in the MPC8306 is conected to DQ0 (Ok).

The data bit 1 in the MPC8306 is conected to DQ6 ??

The data bit 2 in the MPC8306 is conected to DQ2 (Ok).

The data bit 3 in the MPC8306 is conected to DQ4 ??

The data bit 4 in the MPC8306 is conected to DQ3 ??

The data bit 5 in the MPC8306 is conected to DQ1 ??

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The data bit 13 in the MPC8306 is conected to DQ14 ??.

The data bit 14 in the MPC8306 is conected to DQ15 ??.

The data bit 15 in the MPC8306 is conected to DQ13 ??.

 

My question is : Why has the design this strange conection?

 

We must do the connection in this way or with a standard conection Data bit 0 -> DQ0, Data bit 1 -> DQ1, Data bit 2 -> DQ2, ... , Data bit 15 -> DQ15.

 

Thank you for your help.

 

Manuel Ojea

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