Pioneer VSX-LX70 Service Manual page 66

1
Block Diagram of the USB Assy
A
AM
B
CN701
V5USB
1
To
D-
D-
2
USB
D+
connector
D+
3
GND
4
C
V+3R3
Main parts
TCC8600-00X-EA-UG : USB Host control decoder (MP3/WMA/MPEG-4AAC)
D 16M FLASH ROM
64M SDRAM
LOAD SWITCH
E
F
66
1
2
USB ASSY
IC771
LOAD
SW IC
V+1R8
IC702
BUS Power cnt.
V+3R3 V+1R8
Protection flag
XRST
Internal
I/O
Core
IC701
USB Host
TCC8600-00X-EA-UG
V+3R3
IC761 IC762
64M 16M
SDRAM FLASH ROM
Purpose
: Firmware is stored
: Temporary storage area of decoding music file
: Current limitation to USB device power
2
3
V+5D
CN702
V+3R3
IC703
1.8V 3.3V
REG. REG.
IC741
VSX-LX70
3
4
A
AUDIO IN
ASSY
CN516
V+5USB
V+5D
4 4
POWER
3 3
GNDD
6 6
8 8
CTL
1 1
XFLAG
2 2
XRST
System
5 5
Control
USB-Rx
CPU
10 10
USB-Tx
11 11
SPDIF
To DSP DIR
7 7
4