How long is a maximum trace length for KeyStone II DDR3?

j-breeze

HI Champs,

I'd like to know Keystone II DDR3 layout guidelines for discrete components below.

(1) How long is a maximum trace length for address, command, control, and clock from KeyStone II device to the first DDR3 component?

(2) How long is a maximum trace length for DQ, DQS, DQS#, and DM from KeyStone II device to the first DDR3 component?

Thank you in advance for your cooperation.

Best regards,
j-breeze

over 10 years ago

0 Senthilkumar Srinivasan over 10 years ago

TI__Mastermind 43660 points

Hello j-breeze,

There is no explicit requirement on maximum trace length. However, you may need to adhere to the other factors like skew, length matching and stub length etc.,

You could use the below DDR3 length rules spreadsheet to validate the DDR3 interface lengths.

KeyStone DDR3 Length Rules Template v02.xlsx

Regards,

Senthil

0 j-breeze over 10 years ago in reply to Senthilkumar Srinivasan

Mastermind 7560 points

Hi Senthil,

I appreciate your prompt reply. I'll try to use the spreadsheet.

Best regards,
j-breeze

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How long is a maximum trace length for KeyStone II DDR3?