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Are 22-Ω series termination resistors necessary? | Cypress Semiconductor

Are 22-Ω series termination resistors necessary?

Summary: 2 Replies, Latest post by harshad_1712281 on 02 Sep 2016 12:38 PM PDT
Verified Answers: 0
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ylwzzu_1620031's picture
User
5 posts

Hello! the datasheet of AN70707 recommends using 22-Ω series termination resistors to avoid reflection on these lines. When FPGA is close to CYUSB3014(about 40mm), can I leave out the 22-Ω series termination resistors to make it convenient?

mady's picture
Cypress Employee
1093 posts

Hi,

It is recommended irrespective of the length of the traces.

Regards,

- Madhu Sudhan

harshad_1712281's picture
User
12 posts

Hi Madhu Sudhan,

I understand that it is recommended irrespective of the trace length. But is it necessary for all GPIF II lines or just the DQ and CTL lines?

Also should it be placed close to FX3 or the FPGA/ASIC?

Thanks,

Harshad.

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