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TMS320C5515

Yaron Blecher65338
Prodigy 180 points

Hello,

Using PPMODE=001 some CS pins are mapped to SYNCH 0->1 group and some to CLKOUT group.

During reset or power-on reset these pins are in a low state. This situation can cause contentions on DOUT pins of SPI peripherials sharing SPI bus.

Does it mean that during power-on reset or reset SPI CS pins should have a glue logic that keeps them in a high state and release them after boot and pin configuration?

Thanks in advance

Yaron

  • 0
    TI__Expert 7061 points

    Hi;

    During the power-on-reset, the CS pins are set to "low" momentary. if more than one external SPI devices are connected to the DOUT (SPI bus), it could have a contention in a short period time. The glue logic should keep the rest SPI device outputs in Hi-Z.

    Regards

    Wen