Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

how can i connect the VREFB pins of EP3C40F324

I want to connect a DDR SDRAM to bank3 and bank4 of EP3C40F324, the interface is SSTL_2, except data,address,command signals, and i need a 1.25V reference, but there is four VREFB pins in one bank of...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

As I said, I'm not sure if address and command output pins need VREF, but they obviously should use SSTL-2 Class I. I have a SODIMM DDR2 design, but DQ pins are spread over all VREF groups of the two involved banks, so I didn't have to think about using all VREF pins or not. B.T.W. (by the way) is just a typical U.S. english 3 letter short cut.