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OMAPL138 McBSP 4-pin mode?

General Polar
Intellectual 420 points

Other Parts Discussed in Thread: OMAPL138, OMAP-L138

Hi all,

is it possible to use the OMAPL138 McBSP in 4-pin mode, e.g. DR, DX, FSX/R, CLKX/R, if the FSX/R, CLKX/R signals are external?

I've used this for the McASP but can't find a way for the McBSP.

Thanks in advance

GenPol

  • 0
    TI__Mastermind 20790 points

    GenPol,

    I think so, It is possible.
    Frame and Clock Operation:
    Receive and transmit frame sync pulses (FSR/X), and clocks (CLKR/X), can either be generated internally
    by the sample rate generator or be driven by an external source.

    Please refer the section 26.2.5.2 at OMAP-L138 TRM(spruh77) to find more details.

  • 0 in reply to Pubesh
    Intellectual 420 points

    Hello Pubesh,

    I would be lucky, if this will be so obviously and simply. As you may know for the 4-pin mode the following pin combinations are only possible: DX, DR, CLKX or CLKR and FSX or FSR – in total 4. If CLK and FS signals are external, then the CLKR signal should serve also the CLKX pin (or vice versa) as well as the FSR signal should also serve the FSX pin (or vice versa).

    In case of the McASP these connections will be established internally, clearing ASYNC (ACLKXCTL.6) bit , while in the McBSP these connections are possible in the DLB mode only. Please refer the Figure 26-2 Clock and Frame Generation at OMAP-L138 TRM (spruh77) to find more details.

    I can think of CLKG signal as a CLKR/X signal, where SCLKME, CLKSM = 1 and CLKGDV = 0, but I can’t imagine the same trick with the FSG. Please refer the section 26.2.5.2 Sample Rate Generator Clocking and Framing at OMAP-L138 TRM (spruh77) to find more details.

    If you aren’t agree with my argumentation or/and have already experience, please provide me with the needed specific settings of PCR and SRGR registers.

    Kindly
    GenPol