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Altera_Forum's avatar
Altera_Forum
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11 years ago

DDR3 HMC operation rate

Hi, I am confused about the DDR3 HMC operation rate of Cyclone V. The handbook says that "full rate designs might have difficulty in closing timing. Consequently,for high frequency memory in...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

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I also noticed these words. Does it mean high risk to use HMC in Cyclone V? Is there any solution to this? Thanks.

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It is low risk to use HMC in Cyclone V.

The solution is to not operate the MPFE ports using the afi_clk. Instead, use a slower clock (perhaps afi_half_clk, or any other clock in your system).