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ADD_CMD_CTRL length matching

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  • milos.stankovic
    replied
    Thanks Robert!.

    I am aware of routed length and how to length match ADD_CMD_CTRL. It is going to be difficult. To small space.....



    Best regards,
    Milos

    Leave a comment:


  • robertferanec
    replied
    1. RESET is asynchronous (it is not tight up to any timing), it doesn't have to be length matched
    2. The routed length will not show you pin to pin length connections - it shows the total length of the signal copper (including the length of ALL branches, not only the branches you need to take into consideration when measuring length between two pins). So this information can not be used for length matching.

    Leave a comment:


  • milos.stankovic
    started a topic ADD_CMD_CTRL length matching

    ADD_CMD_CTRL length matching

    Hi!

    I have a question about Advanced PCB Layout Course, Lesson 6. It is about ADD_CMD_CTRL Length Matching. According to L6 video,
    these are the signal that are actually length-matched:
    DRAM_A0
    DRAM_A1
    DRAM_A2
    DRAM_A3
    DRAM_A4
    DRAM_A5
    DRAM_A6
    DRAM_A7
    DRAM_A8
    DRAM_A9
    DRAM_A10
    DRAM_A11
    DRAM_A12
    DRAM_A13
    DRAM_A14
    DRAM_A15
    DRAM_CAS_B
    DRAM_RAS_B
    DRAM_SDBA0
    DRAM_SDBA1
    DRAM_SDBA2
    DRAM_WE_B
    DRAM_CS0_B
    DRAM_SDCKE0
    DRAM_SDODT0
    My questions are:
    1. DRAM_RESET_B does not have to be length matched with other signals?
    2. I did not find in Activities folder for any lesson that signals are actually length-matched.
    Take L7 - 02 - Impedance Adjustment for example.
    It is obvious that there are waves on every signal, but yet length ranges from 72.824mm for DRAM_A2 to 85.831 for DRAM_SDCKE0.
    Is our task to length match all signals except DRAM_RESET_B within 5 mils?

    Best regards,
    Milos
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