JTAG: Difference between revisions
From ArmadeusWiki
(New page: I'm trying to get use of JTAG for U-Boot debugging and probably FPGA debugging in the future. This page is not yet finished, and the work is in progress. == Building a JTAG connector for ...) |
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* 20-way flat cable, 1.27mm pitch (Conrad: 609463) | * 20-way flat cable, 1.27mm pitch (Conrad: 609463) | ||
Assembling it all together: | |||
# Solder the 40-in header onto the J19 connector on the apf27dev board | # Solder the 40-in header onto the J19 connector on the apf27dev board | ||
# Cut off a ~10cm piece from the ATA cable with the 40pin plug at the end. | # Cut off a ~10cm piece from the ATA cable with the 40pin plug at the end. | ||
# Cut off ~10cm from 20-way flat cable | # Cut off ~10cm from 20-way flat cable | ||
# Carefully attach the 20-pin header to the flat cable. The thing is easy to break and it requires some forcing. Better buy a spare piece in advance. | # Carefully attach the 20-pin header to the flat cable. The thing is easy to break and it requires some forcing. Better buy a spare piece in advance. | ||
# Use a knife and a cutting pad and dissect the cable endings, ~3cm long. | # Use a knife and a cutting pad and dissect the cable endings, ~3cm long. Dissect the whole width of the 20-way cable and only pins 40 to 31 on the 40-way ATA cable. | ||
# Strip the cable endings | # Strip the cable endings | ||
# Solder the two cables together, as specified below | # Solder the two cables together, as specified below: | ||
{| class="wikitable" border="1" | |||
|- | |||
! ARM JTAG 20-pin cable | |||
! apf27 J19 40-pin cable | |||
|- | |||
| 1 - Vddh (+3.3v) | |||
| 39 | |||
|- | |||
| 2 - Vddh (+3.3v) | |||
| 39 | |||
|- | |||
| 3 - nTRST | |||
| 33 | |||
|- | |||
| 4, 6, 8, 10, 12, 14, 16, 18, 20 - Vss (ground) | |||
| 31, 34, 40 | |||
|- | |||
| 5 - TDI | |||
| 35 | |||
|- | |||
| 7 - TMS | |||
| 36 | |||
|- | |||
| 9 - TCK | |||
| 37 | |||
|- | |||
| 13 –TDO | |||
| 38 | |||
|- | |||
| 15 – nRST | |||
| --- | |||
|} | |||
Revision as of 00:00, 28 March 2009
I'm trying to get use of JTAG for U-Boot debugging and probably FPGA debugging in the future. This page is not yet finished, and the work is in progress.
Building a JTAG connector for apf27Dev board
List of material and part numbers at Conrad:
- 2x20-pin header, 2.54mm pitch (Conrad: 741973)
- ATA/IDE cable (Conrad: 971742)
- 2x10-pin IDC low profile header, 2.54mm pitch (Conrad: 743534)
- 20-way flat cable, 1.27mm pitch (Conrad: 609463)
Assembling it all together:
- Solder the 40-in header onto the J19 connector on the apf27dev board
- Cut off a ~10cm piece from the ATA cable with the 40pin plug at the end.
- Cut off ~10cm from 20-way flat cable
- Carefully attach the 20-pin header to the flat cable. The thing is easy to break and it requires some forcing. Better buy a spare piece in advance.
- Use a knife and a cutting pad and dissect the cable endings, ~3cm long. Dissect the whole width of the 20-way cable and only pins 40 to 31 on the 40-way ATA cable.
- Strip the cable endings
- Solder the two cables together, as specified below:
| ARM JTAG 20-pin cable | apf27 J19 40-pin cable |
|---|---|
| 1 - Vddh (+3.3v) | 39 |
| 2 - Vddh (+3.3v) | 39 |
| 3 - nTRST | 33 |
| 4, 6, 8, 10, 12, 14, 16, 18, 20 - Vss (ground) | 31, 34, 40 |
| 5 - TDI | 35 |
| 7 - TMS | 36 |
| 9 - TCK | 37 |
| 13 –TDO | 38 |
| 15 – nRST | --- |
