Texas Instruments DRA72 Series, User Manual, Page: 30 / 39

COM8Q
Connector
Expansion
Connector
SPI2
SPI2_SCLK, _D[1:0], _CS[0]
Mux
K
A1 B1
B2
SPI2_SCLK, _D[1:0], _CS[0]
SoC
UART3
UART3_TX, _RX, _CTS, _RTS
CBT3257
A1=B1 or A1=B2
Ethernet
Expansion
Connector
VIN1B
VIN1B_CLK, _VS, _HS, _DE, _DA[7:0]
Mux
J
A1 B1
B2
RGMII0_TXC, _TXCTL, _TXD[3:0],
_RXC, RXCTL, _RXD[3:0]
UART3_RXD, _TXD
MDIO_MCLK, _D
SoC
CBT16212
A1=B1 or A1=B2
RGMII0, MDIO
RGMII0_TXC, _TXCTL, _TXD[3:0],
_RXD, _RXCTL, _RXD[3:0]
MDIO_MCLK, _D
Signal Multiplex Logic
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DRA72x EVM CPU Board User's Guide
Mux J: Selects between Gig Ethernet and expansion, as shown in Figure 18 . The selection is made using
the IO expander #2 and bit P4, defaulting to Gig Ethernet.
Figure 18. Mux Diagram for RGMII0 and VIN1B
4.7 SPI2 and UART3 Selection (Mux K)
Figure 19 is part of the SoC pinmux table for SPI2. The SoC device supports additional functions not
shown in the table. The functions shown are intended to reflect those supported on the EVM. These
include:
• SPI Serial Bus (SPI2): SCLK, D[1:0], CS[0]
• UART Serial Bus (UART3): TXD, RXD, CTSN, RTSN
Figure 19. SoC Pinmux for SPI2 and UART3
Mux K: Selects between Bluetooth (COM8Q module) and expansion interface, as shown in Figure 20 . The
selection is made using the IO expander #2 and bits P16, defaulting to expansion.
Figure 20. Mux Diagram for SPI2 and UART3