Texas Instruments Hercules TMS570LS31x, User Manual, Page: 11 / 26

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Connectors
11 SPNU509C – September 2011 – Revised November 2018
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Physical Description
2.2.1 20-Pin ARM JTAG Header
In addition to on board XDS100V2 JTAG, one 20-pin ARM JTAG header is added for using external
emulator. This is the standard interface used by JTAG emulators to interface to ARM microcontrollers. The
pinout for the connector is shown in
Table 2-2 .
Table 2-2. 20-Pin ARM JTAG Header
Signal Name Pin Number Pin Number Signal Name
Vref 1 2 V
CC
nTRST 3 4 GND
TDI 5 6 GND
TMS 7 8 GND
TCK 9 10 GND
RTCK 11 12 GND
TDO 13 14 GND
nRST 15 16 GND
NC 17 18 GND
NC 19 20 GND
2.2.2 Ethernet Interface
The TMS570LS3137 integrates an MII/RMII Ethernet MAC on chip. This interface is routed to the on
board PHY via CBT switches. The board uses a DP83640 PHY. The interface is isolated and brought out
to a RJ-45 connector with integrated magnetics, J1. The pinmux control DIP S2 is used to control the CBT
FET switch for RMII, MII or other functions.
The J1 connector is used to provide a 10/100 Mbps Ethernet interface. This is a standard RJ-45
connector. The cable end pinout for the J1 connector is shown in
Table 2-3 .
Table 2-3. J1, Ethernet Interface
Pin Number Signal Pin Number Signal
1 D0+ 2 D0-
3 D1- 4 D2+
5 D2- 6 D1-
7 D3+ 8 D3-
Two LEDs are embedded into the connector to report link status (green LED) and transmit and receive
status of the PHY (yellow LED).
2.2.3 CAN Interface
The TMS570LS3137 has up to three DCAN interfaces that provide a high-speed serial interface. Two 3-
pin screw terminal blocks, J2, J3, are used to interface to the DCAN bus. The pinouts for this connector
are shown in
Figure 2-4 . H means CAN High (CAN H), and L means CAN Low (CAN L).