Siemens ERTEC200 - Manual (Page 95)

11.2 Trace Interface
The trace interface is parameterized, enabled, and disabled by means of a connected debugger (e.g. by Lauterbach) on
the JTAG interface.
A Trace port is provided in the ERTEC 200 for tracing internal processor states:
• PIPESTA
[2:0]
• TRACESYNC
• TRACECLK
• TRACEPKT[7:0]
The PIPESTA[2:0], TRACEPKT[7:0], and TRACESYNC signals are alternative signal pins at the LBU interface. The
trace interface is activated with the configuration pins CONFIG[6,5,2] = 101. The trace interface can be assigned
parameters in the debugger with 4-bit or 8-bit data width. If a data width of 4 bits is assigned, the TRACEPKT[3:0] signals
are automatically switched to trace function. If a data width of 8 bits is assigned, the TRACEPKT[7:4] signals are also
switched to trace function.
For connectors, pinning, and hardware circuitry for the Trace interface, refer to /7/.
11.3 JTAG Interface
Besides the debug function, the JTAG interface is also used for the boundary scan (see /9/). In addition to the JTAG
interface, the DBGREQ and DBGACK signals are available as alternative function pins for debugging. Due to the
different debuggers (Hitex or MC types), an internal pull-up resistor at the TRST_N JTAG pin is not included. The user
has to ensure the proper circuitry for the utilized debugger .
The standard connector for JTAG interfaces is a 20-pin connector with a pin spacing of 0.1 inch. All JTAG pins and the
two additional DBGREQ and DBGACK pins are connected here. The connector is assigned as follows:
Function Pin No. Pin No. Function
Vcc-Sense 1 2 Vcc
TRST_N 3 4 GND
TDI 5 6 GND
TMS 7 8 GND
TCK 9 10 GND
RTCK (#1) 11 12 GND
TDO 13 14 GND
RST (#1) 15 16 GND
DBGREQ 17 18 GND
DBGACK 19 20 GND
Table 35: Pin Assignment of JTAG Interface
For connectors, pinning, signal description, and hardware circuitry for a standard JTAG interface for the multi-ICE
debugger, for example, refer to /8/.
In addition to the standard JTAG connector, the pins can also be connected to the Trace interface.
For connectors, pinning, and hardware circuitry for JTAG signals at the Trace interface, refer to /7/.
11.4 Debugging via UART
If the UART is not used for user-specific tasks, it can also be used as a debugging interface. An effective realtime
debugging is possible if the IRQ interrupt sources of the UARTare mapped to the FIQs with numbers 6 or 7. This enables
debugging of interrupt routines.
Copyright © Siemens AG 2007. All rights reserved. 95 ERTEC 200 Manual
Technical data subject to change Version 1.1.0