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Original question:

SCANSTA112: SCANSTA112 multidrop question

SCANSTA112: 2 scansta112 on one board

Roy Heyder
Prodigy 10 points
Part Number: SCANSTA112

Tool/software:

question configuring 2 scansta112 on 1 board. For a total of 10 ports what would be the recommended configuration for the scansta112? multi drop or can scansta112 work in multi layer mux where one port on the first mux would select the second mux input port. If either would work would there be any benefit for for either configuration?

  • 0
    TI__Guru*** 145550 points

    Hi Roy:

        Both should work, but it depends on how is your system works.

        Multidrop can be used  If  the  user might wish to select all the SCANSTA112s in the system at once.  the same boundary scan operation is to be performed on all the boards in the system simultaneously: a board test, programming of a programmable device, or some other boundary scan operation.

      A hierarchical system can be used  If the user might wish to select some, but not all, of the SCANSTA112s in the system and perform boundary scan operations only through the selected devices, 

    Best

    brian

  • 0
    Prodigy 10 points

    Brian, Thanks for your reply. I think there would be more scan coverage if the entire chain can be accessed simultaneously. Can you provide details of the connections between the 2 scansta112 so either point to point or entire chain simultaneously can be accessed. Please be aware both scansta112 would be on the same board so the 10 jtag devices can be scanned. 

  • 0 in reply to Roy Heyder
    TI__Guru*** 145550 points

    Roy:

      i will get  details by tomorrow.

    Regards

    Brian

  • 0 in reply to Brian Zhou
    Prodigy 10 points

    ANy update?

  • 0 in reply to Roy Heyder
    TI__Guru*** 145550 points

    Hi Roy:

       Sorry for late response:

     If you have two boards on the same board with backplane, it  can be either flat or hierarchical.

    Below is flat system, If the user wishes to select only a single SCANSTA112 from multiple SCANSTA112s in a system. Each of the SCANSTA112s must be assigned a unique slot address using the address pins on the device S(0-7). . The boundary scan controller will begin the sequence of boundary scan operations by addressing the desired SCANSTA112 using its unique slot address.

    A second scenario is one in which all the SCANSTA112s in the system are to be selected. In this scenario, instead of selecting a SCANSTA112 by using its unique slot address, all the SCANSTA112s in the system are selected simultaneously using the predefined broadcast address. When addressed this way, all the selected SCANSTA112s define parallel active scan chains

    In a system with multiple SCANSTA112s, all the SCANSTA112s must operate in ScanBridge mode. this is level 1 protocol .

    Once the Level 1 protocol has been carried out and the desired SCANSTA112(s) have been selected, the desired LSPs for each SCANSTA112 must be selected and unparked. This is accomplished by the Level 2 protocol .

    The contents of the mode registers (mode register 0, mode register 1, and mode register 2) of a SCANSTA112 operating in ScanBridge mode control the selection of LSPs. 

    What is real application for this project?

    Best

    Brian