comparison pirelli/mcsi @ 56:fdfb57a1c5fe

Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sun, 20 Oct 2013 04:49:28 +0000
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55:037c9bea954c 56:fdfb57a1c5fe
1 Tracing all 4 MCSI signals starting from the Calypso
2
3 MCSI_TxD: Calypso ball L10, L1 trace goes to (3829,474). The trace on L2 gets
4 lost in the edge grind-down damage.
5
6 MCSI_RxD: Calypso ball M10, no visible trace on L1 - perhaps there is a
7 micro-via under the ball? The ball pad coords are (3841,499). Looking at L2,
8 the micro-via hypothesis seems to be correct: a trace from those coords goes in
9 the same bunch as the MCSI_TxD. But then it gets lost in the damage too.
10
11 MCSI_CLK: Calypso ball N10, L1 trace goes to (3898,369). L2: joins the same
12 bunch with MCSI_TxD and MCSI_RxD, then gets lost in the damage.
13
14 MCSI_FSYNCH: Calypso ball K9, L1 trace goes to (3865,524). L2: same story as
15 the others.