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VSBC-6862 Rev 1.43

3.11. IEEE-1149.1 interface, connector P3

The MPC-8260 provides a dedicated user-accessible test access port (TAP) that is fully compatible

with the IEEE 1149.1 Standard Test Access Port and Boundary Scan Architecture. Problems

associated with testing high-density circuit boards have led to development of this standard under the

sponsorship of the Test Technology Committee of IEEE and the Joint Test Action Group (JTAG). The

MPC-8260 implementation supports circuit-board test strategies based on this standard.

This connector definition complies with the industry standard definition for its assignment.

Figure 18: JTAG port pinout

Pin Signal Description

1 TDO Serial output data

2 3.3V 3.3V, max 0.3 mA

3 TDI Serial input data

4 /TRST Scan chain logic reset

5 /QREQ Quiescent request

6 +3.3V +3.3 V power supply, max 100 mA

7 TCK Serial clock

8 n.u. Not used

9 TMS Mode select

10 n.u. Not used

11 /SRESET Software reset

12 GND Ground

13 /HRESET Hardware reset

14 n.u. Not used, used as connector 'key'

15 /CKSTP_OUT Checkstop output

16 GND Ground

 This connector accepts standard DIN41651 16-pin female plug connector.

1 3 5 7 9

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