FreeCalypso > hg > freecalypso-reveng
annotate pirelli/fdp @ 279:a7707c174510
pirelli/{rssi,txcal}: results of the Pirelli to CMU200 experiment
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 16 Feb 2019 18:30:11 +0000 |
parents | cbd944ebeff0 |
children |
rev | line source |
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275
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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1 The trace from S71PL129NC0 ball D5 (flash reset) goes to a pull-up resistor and |
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
2 to a microvia at (5130,717). On L7 this microvia connects to an inner via at |
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
3 (5141,681). Found it on L2, trace from inner via goes to a microvia to L1 at |
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
4 (4676,922). On L1 the trace goes to a pair of resistor footprints, the left |
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
5 one is populated, the right one is not. Tracing the populated branch: the |
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
6 trace goes to a microvia at (4516,1047). On L2 the microvia connects to an |
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
7 inner via at (4540,1032). Found it on L4, the trace goes through another inner |
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
8 via at (3718,1052) and finally to yet another inner via at (1699,1348). |
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
9 |
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
10 Tracing the populated branch from (1699,1348): found it on L2, goes to a |
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
11 microvia back to L1 at (1673,1352). It is TCXOEN! |
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
12 |
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
13 Tracing the unpopulated resistor branch: microvia from L1 to L2 at (4665,892). |
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
14 On L2 the trace goes two ways: to another microvia back to L1 at (4142,802) and |
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
15 to an inner via at (5150,834). The microvia back to L1 at (4142,802) falls on |
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
16 Calypso ball F4 - that's FDP! Tracing the inner via at (5150,834): found it on |
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
17 L7, trace obscured by damage, apparently ends at (5169,751), there may have |
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
18 been a microvia around (5166,709). It might be plausibly connected to the |
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
19 WP#/ACC pin, which is also pulled up like RST#, but the damage makes it |
cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
20 impossible to trace for certain. |