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UPP channels

Calum Mackinnon
Genius 4155 points
Other Parts Discussed in Thread: OMAP-L138

Hi

 Question for you regarding the OMAP-L138 DSP.  The datasheet shows terminal functions for the universal parallel port (UPP) on page 59.  The device has two UPPs: a channel “A” and a channel “B”.  The table on page 59 indicates which channel the control signals correspond to, but the table on page 60 does not indicate which channel the data signals correspond to.  Are the UPP_D[15:0] signals channel “A” and the UPP_XD[15:0] signals channel “B”?  Or is there a register somewhere that indicates which channel (A or B) the UPP_D[15:0] and UPP_XD[15:0] bits should be assigned to?  I can’t tell from the datasheet whether the data bit channel assignment is hardwired to the pin or if it is selectable.

Thanks for your help,

  • 0
    TI__Expert 8890 points

    The uPP DATA and XDATA pins are assigned to channels A and B depending on the operating mode of the uPP peripheral.  In 1-channel mode, only the DATA pins are used.  in 2-channel mode, Channel A uses DATA[0:7] and XDATA[0:7], while Channel B uses DATA[8:15] and XDATA[8:15].  (If both channels are operated in 8-bit mode, then only the DATA pins are used.)  For more information, please refer to Table 3 in the uPP peripheral user guide.

    Hope this helps.