asadi.siyavash
Member level 4
Hello,
I want to design FPGA board with 64 bit DDR3 interface (4 DDR3). I choose FLY-BY topology. I read many documents about DDR3. but I am confused because I didn't know how I can set the value of external resistor termination of address command and control. I saw many different value in many boards. some of them used 47ohm (e.g. ti-am5728 board) or 40.2ohm (e.g. Genesys 2) or 30ohm (e.g. micron TN-41-13 document). could someone tell me how we can set this parameter?
any help would be greatly appreciated.
Siyavash
I want to design FPGA board with 64 bit DDR3 interface (4 DDR3). I choose FLY-BY topology. I read many documents about DDR3. but I am confused because I didn't know how I can set the value of external resistor termination of address command and control. I saw many different value in many boards. some of them used 47ohm (e.g. ti-am5728 board) or 40.2ohm (e.g. Genesys 2) or 30ohm (e.g. micron TN-41-13 document). could someone tell me how we can set this parameter?
any help would be greatly appreciated.
Siyavash