Panasonic DX-600, Руководство по обслуживанию

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234
DX-600/800
APR 2002
Edition 1.0
6.2.14 LAN Control Circuit
LAN Controller
1. LAN Controller (IC1)
This conforms to IEEE 802.3 Ethernet Controller. The CPU (SC PCB) bus is directly connected and the
data interrupt is controlled by pLANINT. The 25 MHz clock is supplied by OSC 1. The LAN Controller
for the system timing clock divides the frequency provided from OSC1. The clock signal is also
supplied for the Manchester encoding/decoding circuit for data conversion.
The LAN Controller is a mixed signal Analog/Digital device that implements the MAC and PHY portion
of the CSMA/CD protocol at 10 and 100Mbps.
The LAN controller contains a built in 8 KByte RAM for transmission and reception buffer.
2. EEPROM (IC2)
This memory stores the configuration registers and MAC (Media Access Control) address for the LAN
controller. Data is transferred to LAN controller (serial transfer) when the power is turned "On". The
MAC address for the LAN controller represents the location on the LAN.
3. Filter Transformer (T1)
A choke module transformer with a EMI filter. The output TX signal from the LAN controller is
differentiated and transmitted on to the LAN via this module. Similarly, the input RX signal
(differential input pair) is terminated by an externally connected 75 ohms resistor and input to the LAN
controller via this module.
4. Ethernet Interface
Provides the 10Base-T/100Base-TX Ethernet interface.
FROM 4MB
Image Memory
(IC10)
LANB
PCB
LANC
PCB
CPU
V850E/MA1
(IC1)
SHINE
DZAC000273
(IC3)
FROM 4MB
Program
(IC9)
MN86075
(IC30)
MODEM
MN195006
(I22)
DAA
Si3021,
Si3015
(IC23,24)
D-BUS
Laser Printer
CCD PCB
Line
Line
Memory
Page
Memory
ECM
Buffer
S-DRAM 8MB
(IC7)
(2)
Transformer
(T1)
LAN Controller
(IC1)
RJ45
LINK
ACTIVITY
INTERNET
(10Base-T/100Base-TX)
(1)