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annotate pirelli/audio @ 56:fdfb57a1c5fe

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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
parents 037c9bea954c
children 2bec477178fc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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55
037c9bea954c Pirelli PCB: traced the earpiece and loudspeaker analog signals
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
1 Tracing EARN & EARP outputs from Iota. On L1 they go to vias at (2422,518) and
037c9bea954c Pirelli PCB: traced the earpiece and loudspeaker analog signals
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
2 (2449,518). On L2 they go to vias at (2455,322) and (2492,323). Tracing made
037c9bea954c Pirelli PCB: traced the earpiece and loudspeaker analog signals
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
3 difficult by flaws in steve-m's grind-down process, but they appear to go to L4,
037c9bea954c Pirelli PCB: traced the earpiece and loudspeaker analog signals
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
4 where they then seem to go to other vias at (491,1254) and (490,1292). Found
037c9bea954c Pirelli PCB: traced the earpiece and loudspeaker analog signals
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
5 them on L7: going to immediately adjacent micro-vias at (514,1255) and
037c9bea954c Pirelli PCB: traced the earpiece and loudspeaker analog signals
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
6 (514,1295). On L8 they go to the earpiece speaker.
037c9bea954c Pirelli PCB: traced the earpiece and loudspeaker analog signals
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
7
037c9bea954c Pirelli PCB: traced the earpiece and loudspeaker analog signals
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
8 Tracing the loudspeaker signal path starting with the physical speaker connector
037c9bea954c Pirelli PCB: traced the earpiece and loudspeaker analog signals
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
9 on L1. The connector part center is about (1930,212). The connector footprint
037c9bea954c Pirelli PCB: traced the earpiece and loudspeaker analog signals
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
10 on L1 is damaged by steve-m's grind-down process (almost gone), but there seem
037c9bea954c Pirelli PCB: traced the earpiece and loudspeaker analog signals
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
11 to be micro-vias at (1756,251) and (2005,237). On L2 they go to (1788,231) and
037c9bea954c Pirelli PCB: traced the earpiece and loudspeaker analog signals
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
12 (2021,264). On L7 they go to micro-vias at (1784,262) and (1992,252). On L8
037c9bea954c Pirelli PCB: traced the earpiece and loudspeaker analog signals
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
13 they go by some caps and then back to new micro-vias! The latter are at
037c9bea954c Pirelli PCB: traced the earpiece and loudspeaker analog signals
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
14 (1902,220) and (1903,259). On L7 the grind-down damage gets in the way again,
037c9bea954c Pirelli PCB: traced the earpiece and loudspeaker analog signals
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
15 but they appear to go to vias at (1935,218) and (1934,260). Found them on L3:
037c9bea954c Pirelli PCB: traced the earpiece and loudspeaker analog signals
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
16 going to new vias at (3703,311) and (3739,313). (It might actually be L4.)
037c9bea954c Pirelli PCB: traced the earpiece and loudspeaker analog signals
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
17 Found them on L7: fat traces to micro-vias at (3870,934) and (3898,869).
037c9bea954c Pirelli PCB: traced the earpiece and loudspeaker analog signals
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
18 Finally on L8 they go to the Winbond chip! The speaker connection pins appear
037c9bea954c Pirelli PCB: traced the earpiece and loudspeaker analog signals
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
19 to be the two leftmost ones in the top row of 9 pins.
56
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
20
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
21 Calypso-Iota Voice Band interface
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
22
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
23 Tracing the Calypso voice output signal, starting from Calypso ball P14 (VDX).
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
24 On L1 it goes to a via at (3401,429). On L2 it branches: one end goes to
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
25 (3366,304) - suspected via back to L1 for a test point, and the other end goes
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
26 to (2885,917) - also a suspected via back to L1. Found the 1st branch on L1:
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
27 it's a short trace to another via at (3291,304). Found the 2nd branch on L1
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
28 too: it goes to Iota ball F5 (VDR), matching the Leonardo schematics.
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
29
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
30 Now let's trace the branch that went to (3291,304) on L1. On L2 it goes to a
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
31 short trace that goes to (3349,197) - suspected micro-via back to L1. Looking
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
32 on L1: yes, indeed the trace seems to lead back here, but then the edge
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
33 grind-down damage gets in the way. Looking at the L1 populated photo, the
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
34 trace definitely seems to go to an exposed test point.
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
35
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
36 The apparent lack of a switch or MUX on the Iota digital voice input strongly
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
37 suggests that in Wi-Fi VoIP operation the Calypso DSP acts as a forwarder for
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
38 the digital voice samples, which are being fed to it from the VoIP chip via
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
39 another interface: MCSI, or perhaps the otherwise unused MODEM UART switched
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
40 over to DSP ownership.