Reference resistors needed on unused XFI interface?

Richard Yearsley

Other Parts Discussed in Thread: AM5K2E04

Hello,

Could you tell me if I need to have the 3K reference resistors connected to the XFIREFRES0/1 pins when this interface is not used?

I can see from the hardware guide that the clock can be left floating, but don't see any mention of the resistors.

Thank you,

Richard

over 10 years ago

0 Ganapathi Dhandapani95 over 10 years ago

TI__Mastermind 28085 points

Hi,

Have you using keystone II device for your design? Provide the DSP part number, our peripheral experts will answer your question.

Please take a look at below Keystone Hardware Resources links:

Schematic Checklist: processors.wiki.ti.com/.../Keystone_Multicore_Device_Family_Schematic_Checklist

K2Ex Hardware Design Guide: processors.wiki.ti.com/.../K2Ex_Hardware_Design_Guide

66AK2Hx Hardware Design Guide: processors.wiki.ti.com/.../66AK2Hx_Hardware_Design_Guide

Thanks,

0 Senthilkumar Srinivasan over 10 years ago

TI__Mastermind 43660 points

Hello Richard,

The XFIREFRES0/1 pins can be left floating when this interface is not used, no need to connect resistor on these pins.

Regards,
Senthil

0 one and zero over 10 years ago in reply to Senthilkumar Srinivasan

TI__Mastermind 18146 points

Hi,

in general the Hardware Design Guide describes what to do with pins of unused peripherals ...

Kind regards,

one and zero

0 Richard Yearsley over 10 years ago in reply to one and zero

Prodigy 210 points

Hi Senthil/Ganapathi/One and Zero.

I forgot to mention the device in use is an AM5K2E04/05

I will leave these pins disconnected in my design.

Thank you,
Richard

0 Ganapathi Dhandapani95 over 10 years ago in reply to Richard Yearsley

TI__Mastermind 28085 points

Thanks for your update.

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Reference resistors needed on unused XFI interface?