DMAREQ[32]
PINMMR175[0]
GIOA[0]
I2C2 receive
EPWM1_SOCA
MIBSPI2[2]
MIBSPI4[2]
DMA
DMAREQ[47]
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I/O Multiplexing and Control Module (IOMM)
6.5.12 Selecting GIO Port for External DMA Request
GIOA and GIOB ports can be used to generate external DMA request. See the datasheet for the DMA
request mapping. The polarity of the GIO pin to trigger a DMA request can be selected inside the DMA
module. In order to use GIO pin as an external DMA request input, the corresponding pin must be first
selected by the application. By default, it is unselected. See Figure 6-9 for illustration. In this illustration,
the DMQREQ[32] input to the DMA module can come from several different sources including GIOA[0]. By
default with PINMMR175[0] = 1, all other sources except GIOA[0] can be selected to generate a DMA
request. Care must be taken by the application that only one source is active while other sources are
inactive from their respective modules. When PINMMR175[0] = 0, only GIOA[0] is selected to generate the
DMA request.
Figure 6-9. Using GIO Pin for External DMA Request
Table 6-10. GIO DMA Request Select Bit Mapping
GIO Pin GIO DMA Request Select Bit Bit Value to Select GIO
GIOA[0] PINMMR175[0] 0
GIOA[1] PINMMR175[8] 0
GIOA[2] PINMMR175[16] 0
GIOA[3] PINMMR175[24] 0
GIOA[4] PINMMR176[0] 0
GIOA[5] PINMMR176[8] 0
GIOA[6] PINMMR176[16] 0
GIOA[7] PINMMR176[24] 0
GIOB[0] PINMMR177[0] 0
GIOB[1] PINMMR177[8] 0
GIOB[2] PINMMR177[16] 0
GIOB[3] PINMMR177[24] 0
GIOB[4] PINMMR178[0] 0
GIOB[5] PINMMR178[8] 0
GIOB[6] PINMMR178[16] 0
GIOB[7] PINMMR178[24] 0
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