TMS320F2800137: 带死区的PWM，在duty为0时，为什么PWMB路输出一直为高电平

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For this use-case, all three ePWM modules are set up for active high complementary signals. Meaning ePWMxA
remains as is with a rising edge delay (RED) and ePWMB has the same source signal as ePWMA, but it is
inverted with a falling edge delay (FED) instead of a rising edge delay. Figure 5-1 illustrates these two signals.
In order to set up these signal pairs, utilize the deadband submodule as it allows you to apply this scheme of
outputs along with many other signal pairs.
To begin, take a look at the deadband submodule, which is essentially a set of switches that work together to
achieve the desired output. S4 and S5 decide what the source signal is for the rest of the submodules: ePWMA
or ePWMB. Since you want the same source signal for both resulting ePWMA and ePWMB outputs, set both
switches to the ePWMA input. Next is S8, which is responsible for deciding which of the outputs will have RED
and FED or both applied to it. Only one channel, either A or B, can have both RED and FED.

在这部分说明为了能处理更多的信号而如此设计。这是对于这部分的说明