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TMS570LC4357-EP: Where is the VCLK_SYS divider?

Mark Samarin
Prodigy 150 points
Part Number: TMS570LC4357-EP
Other Parts Discussed in Thread: HALCOGEN

I can't find where to set VCLK_SYS in any registers.  

Figure 5.6.2.2 in the EP datasheet shows a divider from HCLK  to VCLK_s but I can't find anyplace to set the divider (or any guidance on what it should be).

Does it just  follow VCLK?  If so the diagram should be changed to reflect this.

Regards,

Mark

  • 0
    TI__Guru 73461 points

    Hi Mark,

    If you are using HALCoGen you can easily adjust VCLK dividers from GUI

    If you are not using HALCoGen then you have to control these dividers with the CLKCNTL and CLK2CNTRL registers.

    --

    Thanks & regards,
    Jagadish.

  • 0 in reply to jagadish gundavarapu
    Prodigy 150 points

    We are not using HALCOGEN and this mysterious VCLK_s signal does not appear to be documented in the technical reference.  The ONLY place I see it is in the  5.6.2.2 in the EP datasheet.

    VCLK_s is not in any register description including the one you copy-pasted.    VCLK1 != VCLK_s.    VCLK2 != VCLK_s..   Please reread my question and focus on VCLK_s in the figure I have given, what I see is everything but VCLK_s. 

    * Ok I think I see VCLK_s is generic for VCLK1 and VCLK2,   but not VCLKA4_s.     

    * Can you make this more confusing please?   Who the F uses _s as an index indicator?  And why the underscore?

  • 0 in reply to Mark Samarin
    TI__Guru 73461 points

    Hi Mark,

    I understood the issue now.

    Mark Samarin said:
    VCLK_s is not in any register description including the one you copy-pasted.

    You are right the VCLK_s  divider is missing.

    Mark Samarin said:
    * Ok I think I see VCLK_s is generic for VCLK1 and VCLK2,   but not VCLKA4_s.

    I don't think it is a generic name for VCLK1 and VCLK2 because i could see its disabled bit which is common for HCLK and VCLK_sys

    I mean VCLK_s is nothing but VCLK_sys, but not sure why its divider missing in the TRM. Let me analyze further before providing updates.

    --

    Thanks & regards,
    Jagadish.