The JTAG port of the processor is convenient to access because it is brought to the front of the board and made available on J1. All that is necessary is to add a 20-pin header as shown in the photograph below.
The signals on this connector are as follows:
| 1 - VTref | 2 - Vsupply |
| 3 - nTRST | 4 - GND |
| 5 - TDI | 6 - GND |
| 7 - TMS | 8 - GND |
| 9 - TCK | 10 - GND |
| 11 - | 12 - GND |
| 13 - TDO | 14 - GND |
| 15 - | 16 - GND |
| 17 - | 18 - GND |
| 19 - | 20 - GND |
As far as I know the intel JTAG cables supplied with their development boards are very similar to the well know Wiggler cables. To make one follow the instructions to make a Wiggler cable but when wiring the 25-pin parallel port connector use the following pins:
| Function | DB25 Pin |
|---|---|
| TCK | 2 |
| TDI | 3 |
| TMS | 4 |
| TDO | 11 |
This information came from comments in the source code for JFlashMM.
By
Andrew Wild
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This file last modified
26/09/2005 11:21pm