Canon PowerShot 350 Service Manual - Page 39

Internal, Associated, Circuits

Get Canon PowerShot 350 PDF manuals and user guides View all Canon PowerShot 350 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 39 highlights

Part 2: Technical Information 1.7 ASIC INTERNAL & ASSOCIATED CIRCUITS I Video from analog ckt. A1D 1 MCR CG 2 EXFCK C2FCK (OSC- VD3 HD SSG ADO-6 AD15- 6 D - RAM FIFO A CCDOCCD8 16 mpo_ aMA1MD159 MAn' A RAS NMWE CAS NWOE LUCAS 4 FINOFINS 2 WRST FWE 4 OF3 RRST 2 FRE • • D-RAM Controler FIFO Controler DCT OSD Encorder 1 & 2 1 CSYNC 2 DAYOUT DACOUT 3 VREF IREF COMP ANALOG C 0 m 2 NIRQ NWAIT 5 NDSTB NAASTB FUNW NUBEN NLBEN Mi - CFom I / NRST ASIC IC3001 CF Controler PCMDO PCMD7 PCMAO 6 i5cmA6-, pPCprMoRpDoYi PL,11/K,D2 PcMcE2 Pp umMwuEE 5 PN$MCMWWPAT 5 P MRST P MREG CF Card Connector Fig. 2-7 ASIC & Associated Circuit Block EE Image (Monitor or moving Image) Signal After the analog video passes through the A/D convertor, it enters the ASIC, passes through the DRAM Controller and the DRAM, back into the DRAM Controller through the Microcomputer (MiCom) interface into the RISC MiCom where Y/C processing takes place. Then back through the DRAM and the FIFO Controller and into FIFO. After passing through the FIFO, this signal is used as the monitor image (EE image). It passed back through the FIFO Controller, picks up the on-screen display (OSD) data, is encoded to an NTSC signal, undergoes D/A Conversion into an analog video signal.. After the monitor image enters the RISC MiCom and it Y/C processed, it splits. The recorded image signal passes through the DRAM and DRAM Controller, and into the DCT for Discrete Cosine Transformation. Then it transits the MiCom I/F into the MiCom where it is Quantized and codified for JPEG compression. It then passes back through the MiCom I/F and the into the CF Controller and stored in the CF Card flash memory. The recorded signal is extracted from the CF Card, leaves the CF Controller it transits the MiCom I/F into the MiCom where the JPEG compressed signal is expanded. It then transits the MiCom I/F into the DCT for back transformation. The signal then passes through the DRAM Controller into the DRAM, where it is saved. Additionally, it passes through the FIFO Controller, picks up the OSD data, is encoded to NTSC signal, D/A Converted to an analog video signal. 2-7

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
Part
2:
Technical
Information
1.7
ASIC
INTERNAL
&
ASSOCIATED
CIRCUITS
I
Video
from
analog
ckt.
A
1
D
1
CG
MCR
2
D
-
RAM
FIFO
CCDO-
CAS
A
RAS
NMWE
mpo_
a
MA1-
FINO-
CCD8
16
MD
1
59
MA'
n
L
U
NWOE
CAS
4
FINS
2
A
WRST
FWE
4
O-
RRST
F3
2
FRE
EXFCK
C2FCK
(OSC-
C
0
m
VD3
HD
ADO
-
6
AD15-
6
2
SSG
•
NIRQ
NWAIT
5
NDSTB
NAASTB
FUNW
NUBEN
NLBEN
Mi
-
C
F
om
I
/
D
-RAM
Controler
DCT
•
FIFO
Controler
OSD
Encorder
1
&
2
ASIC
IC3001
CF
Controler
NRST
PCMDO
PCMD7
PCMAO
6
i
5
cmA6-,
5
PCMRDY
PcMcE2
ppropoi
PuMuE
PL,11/K,D2
p
mwE
P$MWP
5
P
MRST
N
CMWAT
P
MREG
CF
Card
Connector
Fig.
2-7
ASIC
&
Associated
Circuit
Block
1
CSYNC
2
DACOUT
DAYOUT
3
VREF
IREF
COMP
ANALOG
<ASIC
Signal
Flow>
EE
Image
(Monitor
or
moving
Image)
Signal
After
the
analog
video
passes
through
the
A/D
convertor,
it
enters
the
ASIC,
passes
through
the
DRAM
Controller
and
the
DRAM,
back
into
the
DRAM
Controller
through
the
Microcomputer
(MiCom)
interface
into
the
RISC
MiCom
where
Y/C
processing
takes
place.
Then
back
through
the
DRAM
and
the
FIFO
Controller
and
into
FIFO.
After
pass-
ing
through
the
FIFO,
this
signal
is
used
as
the
monitor
image
(EE
image).
It
passed
back
through
the
FIFO
Controller,
picks
up
the
on
-screen
display
(OSD)
data,
is
encoded
to
an
NTSC
signal,
undergoes
D/A
Conversion
into
an
analog
video
signal..
<Recorded
Image
Signal>
After
the
monitor
image
enters
the
RISC
MiCom
and
it
Y/C
processed,
it
splits.
The
recorded
image
signal
passes
through
the
DRAM
and
DRAM
Controller,
and
into
the
DCT
for
Discrete
Cosine
Transformation.
Then
it
transits
the
MiCom
I/F
into
the
MiCom
where
it
is
Quantized
and
codified
for
JPEG
compression.
It
then
passes
back
through
the
MiCom
I/F
and
the
into
the
CF
Controller
and
stored
in
the
CF
Card
fl
ash
memory.
<Playback
Image
Signal>
The
recorded
signal
is
extracted
from
the
CF
Card,
leaves
the
CF
Controller
it
transits
the
MiCom
I/F
into
the
MiCom
where
the
JPEG
compressed
signal
is
expanded.
It
then
transits
the
MiCom
I/F
into
the
DCT
for
back
transformation.
The
signal
then
passes
through
the
DRAM
Controller
into
the
DRAM,
where
it
is
saved.
Additionally,
it
passes
through
the
FIFO
Controller,
picks
up
the
OSD
data,
is
encoded
to
NTSC
signal,
D/A
Converted
to
an
analog
video
signal.
2-7