Differences

This shows you the differences between two versions of the page.

--- projects:dslam [2024/04/05 11:43] – [FXS] q3k
+++ projects:dslam [2024/04/05 12:22] (current) – [FXS] q3k
@@ Line 30: / Line 30: @@
 === PSU Recap ===
-The caps on the PSU (APSI-605AC Rev.C) are bad. Here's the values jotted down so that q3k can order some new ones:
+The output smoothing caps on the PSU (APSI-605AC Rev.C) are bad. Here's the values jotted down so that q3k can order some new ones:
 ^ Refdes ^ Capacitance ^ Voltage ^ Diameter ^ Height ^ Lead spacing ^ Replacement ^
@@ Line 40: / Line 40: @@
 There's also a primary side 100uF/400V cap (C13) that has been measured to be ~97uF, which is good enough so is left alone for now.
+=== JTAG Pinout ===
+Refdes J8 'JTAG'.
+^ Function ^ Pin ^ Pin ^ Function ^
+|    Diode |   1 |   2 | Diode    |
+|    Diode |   3 |   4 | GND      |
+|     3v3? |   5 |   6 | GND      |
+|     Hi-Z |   7 |   8 | GND      |
+|     Hi-Z |   9 |  10 | GND      |
+|    Diode |  11 |  12 | GND      |
+|     Hi-Z |  13 |  14 | Hi-Z     |
+|     Hi-Z |  15 |  16 | Diode    |
+|     Hi-Z |  17 |  18 | Hi-Z     |
+|     Hi-Z |  19 |  20 | Hi-Z     |
+Diode means a diode was detected (0.3V-1.6V) from that pin to ground. Hi-z means there didn't seem to be a diode between that pin to ground. This looks like a custom JTAG connector, q3k will attempt to discover the pinout once the PSU is fixed.
+There's also a BDM connector on board.