DS320PR410: READ_EN_N pin function

Ashish Bhadouria

Part Number: DS320PR410

Tool/software:

I am currently working on a design that utilizes the DS320PR410 PCIe Gen 4 redriver, with the intention of programming it via SMBus mode using an external EEPROM. In our design, both the EEPROM and the redriver are powered by the same power net. Additionally, we have set the READ_EN_N pin to low through a pull-down resistor, ensuring that the device is ready to program itself from the EEPROM upon power-up.

I have a specific query regarding the behavior of the DS320PR410 during the programming process. If the device fail to successfully program itself from the EEPROM on the initial attempt, will it automatically continue to retry programming from the EEPROM until the process is completed successfully? Understanding this behavior is crucial for the robustness of our design.

I would greatly appreciate any guidance or documentation you could provide on this matter. Your assistance will help us ensure that our design is both reliable and efficient.

Thank you for your time and support. I look forward to your response.

Regards

Ashish Singh

2 months ago

0 David (ASIC) Liu 2 months ago

TI__Guru**** 156181 points

Ashish

Due to the US Labor Day holiday, the response to your question may be delayed. We will look into your question when we return tomorrow, Sept 3rd. Sorry for the wait and any inconvenience it may cause.

Thanks,

David

0 Nasser Mohammadi 2 months ago in reply to David (ASIC) Liu

TI__Guru* 93670 points

Hi Ashish,

If for some reason, device cannot read or content of EEPROM is corrupted then device would use default register settings. Having said this, we have not come across a case device not being able to read from EEPROM - assuming READN _EN and MODE pins are set correctly.

Regards, Nasser

0 Ashish Bhadouria 2 months ago in reply to Nasser Mohammadi

Intellectual 255 points

Hi Nasser

Thanks for your reply

I am not connecting the READ_EN pin to any other controlling device it is low through pull down resistor.

Kindly see the below image for your reference.

Please see the design and let me know is it ok?

Regards

Ashish

0 Nasser Mohammadi 2 months ago in reply to Ashish Bhadouria

TI__Guru* 93670 points

Hi Ashish,

Schematic looks fine. I am assuming:

1). There are AC coupling Caps on PCIE_IN_RX pins.

2). There are pull up Resistors on EQ_I2C_SCL/SDA pins.

Regards, Nasser

0 Ashish Bhadouria 2 months ago in reply to Nasser Mohammadi

Intellectual 255 points

Hi Nasser

Yes, AC coupling caps on PCIE_IN_RX

Yes, pull up Resistors on I2C SMBUS

Thanks for your response

Regards

Ashish

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DS320PR410: READ_EN_N pin function