Panasonic EB-X400 Service Manual page 28

Block Diagram
READYQ
RxD0
TxD0
RxD1
TxD1
EB-X400 use the ASC1 port for IrDA interface because serial baud rate of ASC1 is up to 115.2 kbps.
This value is satisfies the IrDA requirement. Otherwise, serial baud rate of ASC0 is up to 921.6 kbps. Thus, EB-X400
will use this interface for serial communication in factory and re-programming software.
5.2.7. Melody IC (U2011)
Melody ringing is generated by Melody IC (U2011). This IC supports generation of up to 16 tones, using the FM synthesizer
principle. The control and data interface to the U2011 is provided by connecting the U2001 to the lower byte of the parallel data
bus. Furthermore a 13 MHz clock output and a IRQ input must be provided.
Block Diagram
E-Gold +
(U2001)
EPP1
EPN1
EPP2
D[0:7]
WR#
RD#
A1
CS4#
CLKSX
IRQ#
GPIO
expin
SIM Card IF
Keypad IF
RTC Block
RxD
TxD
IrDA Support
ASC1
Controller
BIU
Figure 5.9. IrDA Block Diagram
EXT1 (Vibrator)
EXT2 (LED)
4.7
4.7
D[0:7]
WR#
RD#
A0
CS#
CLKI
IRQ
RST#
U2011
Figure 5.10. Melody Block Diagram
Autostart Block
hw_wakeup (ECO Block)
S0ASINT
ext_S0_dis
IrDA Support
ASC0
Controller
Autobaudrate
Block
BIU
PD-BUS
OUT_L
To Headset
OUT_R
Z1
Z2 Z3
+
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