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Hyperlink PLL question for C6678

Gabriele_Giannini
Intellectual 925 points
Other Parts Discussed in Thread: TMS320C6678

I have to setup the Hyperlink connection for 2 C6678 DSP

I'm using a reference Clock of 156.25MHz

TMS320C6678 Datasheet says that the supported data rates include 1.25 Gbaud, 3.125 Gbaud, 6.25 Gbaud, 10 Gbaud and 12.5 Gbaud, but Advisory 21 in the Errata says that HyperLink Data Rate is Limited to 40 Gbaud

So i vant to configure the connection for 10GBaud each lane

Using the formula LINERATE=REFCLK*MPY/RATESCALE (Page 23 of SPRUGW8C) i've obtained

156,25MHz * 16 / 0,25 (FullScale) = 10GBaud

But in the Table 2-6, page 24 of SPRUGW8C it seems that this setting is not applicable...

Can i still use this combination of values, or the maximum rate achievable is 6.25 GBaud?

  • 0
    TI__Mastermind 42545 points

    Hi Gabriele,

    The table in SPRUGW8C is out of date. You can used the settings in your post for 10GBaud. This can also be found in the KeyStone Hardware Design Guide in table 20. Be sure to follow all the routing requirements in your design. This is necessary to operate the HyperLink at a 10GBaud data rate.

    Regards, Bill