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TMS320C5517: What is the difference between PUDINHIBR3 and PUDINHIBR4?

user6266825
Prodigy 40 points
Part Number: TMS320C5517

Hello,

In TMS320C5517 Digital Signal Processor Technical Reference Manual (SPRUH16B, April 2014–Revised October 2015),

It seems that the functionality of PUDINHIBR4 is the same as that of PUDINHIBR3.

I can not find the difference.

Is this an error in the manual?

  • 0
    TI__Guru 50170 points

    Hi, 

    We'll look into this and post back once we have an explanation.

    Rex

  • 0 in reply to Rex Chang
    TI__Guru 50170 points

    Hi, 

    In TRM, table 1-53, UHPI, SPI, UART, I2S2, I2S3, and GP[31:27, 20:12] Pin Multiplexing includes the Ball Number and signal names that are associated with PUDINHIBR3. However, there isn't any similar table for PUDINHIBR4. The only place that ties PUDINHIBR4 to the EMIF data is the C5517 datasheet. Please take a look at Table 4-4, EMIF Signal Descriptions. The description for EM_D[15:0] specifies “The IPD resistor on this pin can be enabled or disabled via the PUDINHIBR4 (1C4Ch) register.”

    Hence, PUDINHIBR3 controls the pulldowns for the muxable Parallel Port (HPI, UART, GPIO, I2S2, I2S3), and PUDINHIBR4 controls the pulldowns for the EMIF data pins.

    Rex

  • 0 in reply to Rex Chang
    Prodigy 40 points

    Rex,

    Thank you very much for the clear answer.