FreeCalypso > hg > freecalypso-reveng

annotate pirelli/audio @ 377:34490934ff02

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compal/audio/reg-read-guide written
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 09 Oct 2021 20:24:03 +0000
parents 2bec477178fc
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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
72
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
21 Winbond chip connections
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
22
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
23 Chip orientation: as viewed in steve-m's depopulated L8 picture, the pinout
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
24 is a L/R flip of the diagram in the datasheet (top and bottom match up, left
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
25 and right flipped).
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
26
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
27 VREF appears to go to a cap to GND like in the reference schem.
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
28 VDD has a fat trace going to a cap; there must be some via(s) to L7 for the
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
29 actual power source, but nothing is visible. Coord range to search:
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
30 x between 3786 and 3975, y between 1205 and 1387. Might be a bump at
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
31 (3880,1380). Probably connects to the "fat finger" trace on L7.
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
32
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
33 LED output goes to exposed TP, no visible signs of going anywhere else.
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
34 IRQ output goes to exposed TP at (4174,1316), look for it on L7. Couldn't
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
35 find it - maybe it isn't connected after all? Will try programming the
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
36 chip w/o interrupts.
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
37
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
38 RST input: visible microvia at (4078,1357), found it on L7, goes to (4232,1515),
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
39 looks like a microvia back to L8. Found it on L8: it's an exposed test point
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
40 with the microvia in its centre, and the trace from it goes to SPCA552E ball
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
41 J7! From the Nokia schem, it looks like this SPCA pin is an LCM output that
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
42 can also be repurposed as a GPIO.
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
43
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
44 CS input: visible microvia at (4325,1105) inside an exposed TP. On L7 the long
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
45 trace ends at (1760,1385), looks like a possible microvia back to L8.
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
46 Found it on L8: it connects to a pin on one of the little ICs under the LCD,
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
47 suspected chip select decoder.
2bec477178fc Pirelli PCB re: Winbond chip connections
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 56
diff changeset
48
56
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
49 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
50
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
51 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
52 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
53 (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
54 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
55 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
56 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
57
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
58 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
59 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
60 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
61 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
62 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
63
fdfb57a1c5fe Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 55
diff changeset
64 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
65 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
66 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
67 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
68 over to DSP ownership.