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A question about the Reserved Pins(RSV) on the TMS320C6711D

Epic Vancouver
Intellectual 885 points
Other Parts Discussed in Thread: TMS320C6711D

I have a question about the TI TMS320C6711D DSP reserved pins (RSV).
There are a total of 9 reserved pins. Some require pullups or pulldowns. But since they are reserved, there is not much documentation for them. I am wondering 2 things.
1. If we are spinning a new board, should we connect pin A12 to Cvdd and B11 to Vss as the datasheet recommends for "new designs" or does it really make no difference?
2. When the datasheet recommends a pullup for an RSV pin, should it be pulled up to the core voltage (1.2V) or the I/O voltage (3.3V)?

  • 0
    TI__Mastermind 18130 points

    Epic Vancouver said:
    1. If we are spinning a new board, should we connect pin A12 to Cvdd and B11 to Vss as the datasheet recommends for "new designs" or does it really make no difference?

    We always suggest following what the datasheet says. If your design was following an older revision of the datasheet that stated otherwise chances are this will probably work assuming there's not a note in the errata; however, we can't guarantee that it will work.

    Epic Vancouver said:
    2. When the datasheet recommends a pullup for an RSV pin, should it be pulled up to the core voltage (1.2V) or the I/O voltage (3.3V)?
    Most datasheets specify to which voltage level to connect these pins. I am not sure why this is left out of the 6711D datasheet but I believe D12, N2 and N1 all must be connected to 3.3V, A12 connected to 1.2V and B11 connected to GND.

  • 0 in reply to TimHarron
    TI__Guru*** 125430 points

    The I/O on this device are all 3.3V so in general a pullup is referring to 3.3V.  Since A12 is an exception the datasheet has explicitly called out that pin be tied to the core voltage.