DS80PCI800: DS80PCI800 setting for Gen3

John Liu59

Part Number: DS80PCI800

Dear,

For DS80PCI800, if the rate is setting as float(Auto rate select of Gen1/2 and Gen2 with De-emphasis), customer want to know how to select the correct Level in table 3 in datasheet for Gen3 application?

Thanks.

over 5 years ago

0 Lee Sledjeski over 5 years ago

TI__Mastermind 43795 points

Hi,

The correct setting for PCIe Gen3 applications is "Float".

FLOAT = AUTO Rate Select of Gen1/2 and Gen3 with de-emphasis

Regards,

Lee

0 John Liu59 over 5 years ago in reply to Lee Sledjeski

TI__Intellectual 2735 points

Hi Lee,

Could you please advice how to select the proper level in table3 for Gen3 application?

Thanks.

0 Lee Sledjeski over 5 years ago in reply to John Liu59

TI__Mastermind 43795 points

Hi,

The RATE pin should be set to "Float".

Table 3. Sets the output amplitude and de-emphasis. In most PCIe applications a setting of "Level 4" in Table 3 will work well.

This setting gives enough amplitude for the PCI800 to be transparent to most incoming Tx FIR waveform information.

Regards,

Lee

0 Lee Sledjeski over 5 years ago in reply to Lee Sledjeski

TI__Mastermind 43795 points

Hi,

Additional information: Since system PCIe Tx's will already add Tx equalization to the signal, the redriver usually does not need to add any additional Tx equalization. It will only use its input CTLE (Rx equalization) to help restore and redrive the original signal.

Regards,

Lee

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DS80PCI800: DS80PCI800 setting for Gen3