VIPER Technical Manual | Detailed hardware description |
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JTAG and debug access
Debug access to the PXA255 processor is via the JTAG connector PL10. The
Macraigor Wiggler76Hand EPI Majic77HMX probe have been used to debug the PXA255 processor on the VIPER. There are many other debug tools that can be interfaced to the VIPER for access to the JTAG Interface of the PXA255 processor.
The tables below detail the pins connections between the VIPER and Macraigor
Wiggler78Hor EPI Majic79HMX debug tools. Of the Wiggler80Hand Majic81HMX debug tools the
Wiggler82Hprovides the best low cost solution.
VIPER JTAG connections
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| VIPER PL10 | Debug tools pin names | ||
Pin | Name | Description | MajicMX | Wiggler | |
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1 | VCC3 | 3.3V Supply pin to JTAG debug tool | VTRef, | Vref, | |
VSupply | VTarget | ||||
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3 | GND | Ground reference | GND | GND | |
4 | nTRST | PXA255 JTAG interface reset | nTRST | nTRST | |
6 | TDI | JTAG test data input to the PXA255 | TDI | TDI | |
7 | TDO | JTAG test data output from the PXA255 | TDO | TDO | |
8 | TMS | PXA255 JTAG test mode select | TMS | TMS | |
9 | TCK | PXA255 JTAG test clock | TCK | TCK | |
10 | SRST | System reset | nSRST | nSRST | |
2, 5 | NC | No Connect | - | - | |
- | - | Not required on VIPER. | RTCLK | RTCK | |
- | - | Not required on VIPER | DBGREQ | DBGRQ | |
- | - | Not supported by VIPER | DBGACK | DBGACK | |
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In order to access the PXA255 your JTAG software needs to know the details of the CPLD on the VIPER. The latest version of the ispMACH 4128C 100 Pin
TQFP BSDL file can be found on the Lattice83HSemiconductor web site.
© 2007 Eurotech Ltd Issue E | 72 |