Wired Lan I/F Circuit - Citizen CL-E700 series Technical Manual

(6) Wired LAN I/F circuit

The Wired LAN I/F circuit interfaces with the Ethernet (100BASE-TX / 10BASE-T).
Transmission is done between the CPU (U1A) and the Ethernet via U21 (Drivers, Receivers &
Transceivers).
The 25 MHz clock is output to U21 from the crystal oscillator X2.
ET_MDIO
ET_MDC
ET_RXD3
ET_RXD2
ET_RXD1
ET_RXD0
ET_RXDV
To/From
ET_RXCLK
U1A (CPU)
ET_RXER
nETINTP
ET_TXCLK
ET_TXEN
ET_TXD0
ET_TXD1
ET_TXD2
ET_TXD3
ET_COL
ET_CRS
nRSTIF
U21
Divers, Receivers & Transceivers
11
MDIO
12
MDC
13
RXD3
14
XO
RXD2
15
RXD1
16
RXD0
LED0
18
RXDV
19
RXC
20
RXER
21
RXM
INTRP
22
TXC
23
RXP
TXEN
24
TXM
TXD0
25
TXD1
26
TXP
TXD2
LED1
27
TXD3
28
COL
29
CRS
32
nRST
KSZ8081MNXCA
R158
X2 25MHz
C168
9
C169
XI
8
+3.3V
R160
30
4
5
6
7
R161
31
C170
C171
2-43
Chapter 2 Operating Principles
2-2.
Operation of Control Parts
R159
10Base-T/100Base-TX
J14 Ethernet
12
Y
11
8
75
8
7
7
75
6
75
75
6
5
5
4
4
3
3
2
2
1
1
10
G
9
RJ45 Connector
[SA Main PCB]
CL-E700 series
14
13