Texas Instruments EVMK2G, Руководство пользователя, Страница: 37 / 83

Serial
Expansion
Connector
DB9
Connector
UART
Transceiver Buffer
K2G SoC
USB
Mini-B
Connector
USB to UART
CP2105
Buffer
UART0_RX
CP2105_DP
CP2105_DM
SOC_UART0_CP2105_EN
OE#
OE#
UART0_RTS
UART0_CTS
UART0_TX
UART0_TXVR_EN
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System Description
37 SPRUI65A – April 2016 – Revised January 2018
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Copyright © 2016–2018, Texas Instruments Incorporated
K2G General Purpose Evaluation Module (EVMK2G)
3.24 UART
There are three UART ports available in the EVMK2G.
UART0 debug port is multiplexed between the DB9 port, USB-to-UART converter (CP2105), and the
Serial Expansion header as shown in
Figure 29 .
Table 10. UART0 Multiplexing
Signal SW12 Logic SoC UART0 Pins Connected To
UART0_TXVR_EN
ON Low DB9 connector via RS-232 chip.
OFF High USB-to-UART converter CP2105.
UART1 is connected to the COM8 connector as shown in Figure 30 . Connection to COM8 and eMMC is
muxed and is explained in Section 3.13 .
Table 11. UART1 Multiplexing
Signal Logic Output
WLAN_TRANS_EN
Low SoC UART1 pins are connected to COM8
High MMC1 connected
UART2 is muxed between the BMC UART1 and the 6-pin header, as shown in Figure 31 and explained in
Section 3.5 .
Figure 29. UART0 Interface Block Diagram