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HPI to DDR2 Performance

ti_geek
Prodigy 90 points

DaVinci 6467T.  We are providing 33 MHz driving it up to 1GHz with the PLLM (x32) and the step down to 256 MHz via SYSCLK3.

 

I understand that this is the clock driving HPI.  I am looking for ballpark performance to go from an external host through HPI to DDR hanging off the DaVinci.  Any data? 

The closest I got was old (SPRA964) and the performance numbers in Section 7 are in "MB/s" which means megabytes per second to me.  But in another doc. used MB as megabits?! 

  • 0
    TI__Expert 8260 points

    Hi,

    First of all, you are violating DM6467T data sheet in things:

    1> You are using 33MHz input clock with x32 multiplier (PLLM), which results in 33 * 32 = 1056MHz, which is more than 1GHz. DM6467 can support max 1GHz.

    2> As per the Figure 7-4. PLL1 and PLL2 Clock Domain Block Diagram (Page 145) in DM6467T data sheet (RevB - http://www.ti.com/lit/gpn/tms320dm6467t), SYSCLK3 is not programmable, its fixed. Only SYSCLK4/5/6/8/9/SYSCLKBP are programmable.

    I will get back to you on HPI performance numbers.

    Regards, Srirami.