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PicoZed Hardware Design Where find defintions for clock capable pins?
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Where find defintions for clock capable pins?

rlobdill
rlobdill over 8 years ago

Hi:

Making a carrier card for PicoZed 7030 SOM and can't figure out which LVDS pair can also be used for clocks .

In the PicoZed SOM Hardware User Guide(ver 1.6)  Pg13 it says (last paragraph)
 

Within a PL I/O bank, there are 50 I/O capable of up to 24 differential pairs. Differential LVDS
pairs on a -1 speed grade device are capable of 950Mbps of DDR data. Each differential pair
from Bank 34 and 35 is isolated by a power or ground pin. Additionally, eight of these I/O can be
connected as clock inputs (four MRCC and four SRCC inputs)


So I need to know which eight of the I/O do I use if I want to have them connected as clock inputs?  When I look at the pin-out tables on pages 15-16 I cannot tell by the signal names if they are clock capable.

Thanks, Rich

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  • drozwood90
    0 drozwood90 over 8 years ago

    Hi there,

    The Ultimate source of what pins are what is Vivado itself.
    Open Vivado, create a new project.  When it asks what kind of project to use, choose I/O Planning project.  From there you can choose the SOM or CHIP you are planning to make the CC for.

    I'd also suggest you take a look at UG899 to ensure you understand as much as possible as these pins are the most critical to get correct.
    https://www.xilinx.com/support/documentation/sw_manuals/xilinx2012_2/ug899-vivado-io-clock-planning.pdf

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