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Altera_Forum
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15 years ago

DDR2 termination

hi all, Today I study Altera develop board for DDR2 reference design. the develop kits is stratixIII_3sl150_dev. From this refer schematic, I found that for discrete DDR2 chip, there is 100 oh...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Differential clock 100 ohms parallel termination at the RAM side is used for all DDR2 types, but with DIMM, it's provided on the module. 50 ohm source side series termination should be present for all types as well. I think, there is no effective difference between "discrete" RAM and unbuffered modules.