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Occasional Contributor
Posts: 5
Registered: ‎11-18-2018

from where can I get the reference schematics of BCM53286

 I am using BCM53286 in my design as an Fe switch. Can I get a reference schematic or related documents for the same?

Broadcom
Posts: 299
Registered: ‎02-15-2016

Re: from where can I get the reference schematics of BCM53286

Hi,

Firstly please find the attached BCM953286R reference board schmeatic file.

 

Thanks,

Ryan

Frequent Visitor
Posts: 1
Registered: ‎10-29-2018

Re: from where can I get the reference schematics of BCM53286

Thanks Ryan,

 

will come back to you with our doubts.

Occasional Contributor
Posts: 5
Registered: ‎11-18-2018

Re: from where can I get the reference schematics of BCM53286

Is 3.3v compatible to 2.5V? Do we need to translate 3.3 to 2.5v for MDIO and MDC?

Highlighted
Occasional Contributor
Posts: 5
Registered: ‎11-18-2018

Re: from where can I get the reference schematics of BCM53286

How can we use 3.3V on termination if there is no 3.3V used in the switch?

Broadcom
Posts: 299
Registered: ‎02-15-2016

Re: from where can I get the reference schematics of BCM53286

Hi,

Please find the below comment per your two questions.

1. The MDC, MDIO pins are 3.3V tolerant.

2. I believe you are refer to our application note "CAP-AN102-R" for the backplane design. Please follow the [Backplane Connection/Termination] Figure you attached and follow the [Table1: Termination Bias Requirements] Device BCM53262/M/S.

 

Thanks,

Ryan

Occasional Contributor
Posts: 5
Registered: ‎11-18-2018

Re: from where can I get the reference schematics of BCM53286

 Hi Ryan,

 

Thanks for the above reply.  A few more queries:

1. According to the datasheet, the pins XTALI and XTALO are not 3.3 V tolerant. Are other pins in this device 3.3 V tolerant? 
2. Can SPI and reset coming from CFPGA(3.33V) compatible to the BCM device pins? If not, how should they be connected?

Broadcom
Posts: 299
Registered: ‎02-15-2016

Re: from where can I get the reference schematics of BCM53286

Hi,

Please find the comment below per your questions:

1. Right, the pin XTALI and XTALO are 2.5V level and not 3.3V tolerant.

    The 3.3V tolerant pins are including the configuration pins, programming interface pins, MDC/MDIO pins, LED pins and Reset pin.

2. It's fine the SPI pins are coming from your CFPGA device, suggest please follow the SPI driver in our SDK SW to implement.

    For reset pin, highly recommend to use the external reset device to provide the reset siganl to BCM53286. And please make sure to

    refer to our design guide application note 5328X-AN103-R "Core and I/O Power Sequencing Requirement" section to tollow our

    power on sequencing requirement.

 

Thanks,

Ryan

Occasional Contributor
Posts: 5
Registered: ‎11-18-2018

Re: from where can I get the reference schematics of BCM53286

Hi,  

 

Thanks for the reply. Cna you please share the documents you have mentioned in the reply above.

 

Thanks & Regards,

Megha Agarwal

Broadcom
Posts: 299
Registered: ‎02-15-2016

Re: from where can I get the reference schematics of BCM53286

Hi,

For the doc 5328X-AN103-R, please go to the BCM53286 folder in this community site and download it.

 

Thanks,

Ryan

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