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Table 2-2. 20-Pin ARM JTAG Header

Signal Name Pin Number Pin Number Signal Name

Vref 1 2 V

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 20-Pin Compact TI JTAG Header

We also implemented a compact TI JTAG header (CTI) on the board. This is the standard interface used

by TI and Spectrum Digital JTAG emulators. The pinout for the connector is shown in Table 2-3.

Table 2-3. 20-Pin CTI JTAG Header

Signal Name Pin Number Pin Number Signal Name

TMS 1 2 nTRST

TDI 3 4 TDIS

VTRef 5 6 KEY

TDO 7 8 GND

RTCLK 9 10 GND

TCLK 11 12 GND

NA 13 14 NA

SYSRSTn 15 16 GND

NA 17 18 NA

NA 19 20 GND

2.2.3 CAN Interface

The TMS570LS0432 has two DCAN interfaces which provide a high-speed serial interface. Two 3 pin

screw terminal blocks, J1 and J2, are used to interface with 12 the DCAN bus. The pinouts for this

connector are shown in Figure 2-3. H means CAN High (CAN H), and L means CAN Low (CAN L).

CAN Bus termination is used to minimize signal reflection on the bus. ISO-11898 requires that the CAN

bus have a nominal characteristic line impedance of 120 Ω. Therefore, the typical terminating resistor

value for each end of the bus is 120 Ω. A split termination method is used to help increase EMC

performance. Split termination is a concept that is growing in popularity because emission reduction can

be achieved very easily. Split termination is a modified standard termination in which the single 120 Ω

resistor on each end of the bus is split into two 60 Ω resistors, with a bypass capacitor tied between the

resistors and to ground. The two resistors should match as close as possible.

Physical Description SPNU569–September 2012

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