8.2.3. Dual target connector pinout

The pinout for a dual-processor ETM target connector is shown in Table 8.6.

Table 8.6. Dual target connector pinout

Pin

Signal name

Pin

Signal name

Pin

Signal name

Pin

Signal name

38

Trace signal 1_A

37

Trace signal 1_B

36

Trace signal 2_A

35

Trace signal 2_B

34

Trace signal 3_A

33

Trace signal 3_B

32

Trace signal 4_A

31

Trace signal 4_B

30

Trace signal 5_A

29

Trace signal 5_B

28

Trace signal 6_A

27

Trace signal 6_B

26

Trace signal 7_A

25

Trace signal 7_B

24

Trace signal 8_A

23

Trace signal 8_B

22

Trace signal 9_A

21

nTRST

20

Trace signal 10_A

19

TDI

18

Trace signal 11_A

17

TMS

16

Trace signal 12_A

15

TCK

14

VSupply

13

RTCK

12

VTRef

11

TDO

10

EXTTRIG

9

nSRST

8

DBGACK

7

DBGRQ

6

TRACECLK_A

5

TRACECLK_B

4

No connect

3

No connect

2

No connect

1

No connect

----

Note

Pins 1, 2, 3, and 4 must be true no-connects. For designs with less than 16 trace data pins, unused TRACEPKT pins must be connected to ground.

The TRACECLK connections differ based on:

Asynchronous trace ports

If the two trace ports are asynchronous, TRACECLK_A and TRACECLK_B are driven separately by the ASIC.

Synchronous trace ports

If you want to use a logic analyzer for collecting the trace, it is normally possible to configure both modules to use the same clock. In this situation ARM recommends that you use TRACECLK_A and connect pin 5 to GND.

If you intend to use two TPAs to collect the trace from the two trace ports, TRACECLK_A and TRACECLK_B are both required. ARM recommends that you drive these from two separate pins on your ASIC. This has the advantage that you can run the trace ports asynchronously, without having to make changes to the PCB or the ASIC pinout.

If it is not possible to use separate pins, you can drive both from the same pin provided that:

  • the ASIC pad drivers are capable of driving the increased load

  • both PCB tracks are series-terminated as close as possible to the pin of the ASIC.

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