FreeCalypso > hg > freecalypso-reveng
comparison pirelli/fdp @ 275:cbd944ebeff0
Pirelli PCB RE: traced out Calypso FDP and flash reset input
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Sat, 24 Mar 2018 20:38:24 +0000 |
| parents | |
| children |
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| 274:81641d82ccc6 | 275:cbd944ebeff0 |
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| 1 The trace from S71PL129NC0 ball D5 (flash reset) goes to a pull-up resistor and | |
| 2 to a microvia at (5130,717). On L7 this microvia connects to an inner via at | |
| 3 (5141,681). Found it on L2, trace from inner via goes to a microvia to L1 at | |
| 4 (4676,922). On L1 the trace goes to a pair of resistor footprints, the left | |
| 5 one is populated, the right one is not. Tracing the populated branch: the | |
| 6 trace goes to a microvia at (4516,1047). On L2 the microvia connects to an | |
| 7 inner via at (4540,1032). Found it on L4, the trace goes through another inner | |
| 8 via at (3718,1052) and finally to yet another inner via at (1699,1348). | |
| 9 | |
| 10 Tracing the populated branch from (1699,1348): found it on L2, goes to a | |
| 11 microvia back to L1 at (1673,1352). It is TCXOEN! | |
| 12 | |
| 13 Tracing the unpopulated resistor branch: microvia from L1 to L2 at (4665,892). | |
| 14 On L2 the trace goes two ways: to another microvia back to L1 at (4142,802) and | |
| 15 to an inner via at (5150,834). The microvia back to L1 at (4142,802) falls on | |
| 16 Calypso ball F4 - that's FDP! Tracing the inner via at (5150,834): found it on | |
| 17 L7, trace obscured by damage, apparently ends at (5169,751), there may have | |
| 18 been a microvia around (5166,709). It might be plausibly connected to the | |
| 19 WP#/ACC pin, which is also pulled up like RST#, but the damage makes it | |
| 20 impossible to trace for certain. |