Pioneer AVIC-Z2/XU/UC Service Manual page 302

5
1.4.2 Back-end clock section
For the Video-type models:
An oscillating crystal of 27MHz is used to generate the 27MHz buffer-out (CLK27), audio section clock (EXTCK), and
front-end section clock (MCK16) signals by the IC1507.
For the ROM-type model:
An oscillating crystal of 16.93MHz is used to generate the front-end section clock (MCK16) signal by the IC1301.
IC1507
Clock generator
27MHz
Crystal
VCC33
1.4.3 Back-end stream I/F section (only for the video-type models)
This section functions as an interface to transfer the data read out in the front-end section, between the SODC and the
back-end section.
For DVDs, this section transfers MPEG data, which is generally called MPEG stream. Therefore, the I/F section is called
stream I/F.
Note that the signals are given different names between the IC1301 SODC and IC1503 AVLSI.
1.4.4 Back-end audio circuit section (only for the video-type models)
The three serial audio signals, output from the AVLSI, are applied to the IC1605 (Audio DAC), where they are converted
into analog audio signals. These analog signals are output from the HOST I/F.
Only for the models installed in navigation products, after output from the AVLSI, the same serial signals are directly
put out from the HOST I/F.
The IEC958 (audio/digital out) is available only for the model without DVD-Audio playback function.
IC1503
AVLSI
5
6
IC1503
CLK27
AVLSI
IC1605
EXTCK
AUDIO DAC
MCK16
IC1301
SODC
* MCK33
* IC1601
AWM
* MCK33:The model with DVD-Audio playback
Clock configuration
IC1301 OHDD8-15
SODC
ODA2
O/INTRO
MASTER
Streaming I/F
AVCC5
IC1605
SRCKAV
Audio DAC
ADOUT0
LRCKAV
Audio circuit
6
7
IC1301
MNZS26EDCUB
IC1503
STD0-7
AVLSI
IC1405
STCLK
STVALID
STENABL
Only the models installed in navigation products
IEC 958
The model without DVD-Audio playback
C X - 3 01 6
7
8
79 OSCI1
16.93MHz
Crystal
80 OSCO1
CN1611
HOST I/F
LO
RO
AAGND
CN1501
8
A
B
C
D
E
F
13