CHAPTER 3 THEORY OF OPERATION
Confidential
3-8
1.3.4 Network
interface
It uses the National Semiconductor brand 10 Base-T/100 Base-TX network controller
(LAN91C1131-NE). The pulse transformer and the Link/Active LED are built in the RJ-45
connector.
< HL-2070N >
ADR[3]
ADR[12]
ADR[16]
ADR[6]
ADR[7]
ADR[2]
ADR[11]
ADR[10]
ADR[4]
ADR[15]
ADR[5]
ADR[14]
ADR[13]
ADR[9]
ADR[8]
DATA[8]
DATA[9]
DATA[10]
DATA[11]
DATA[12]
DATA[13]
DATA[14]
DATA[15]
DATA[0]
DATA[1]
DATA[2]
DATA[3]
DATA[4]
DATA[5]
DATA[6]
DATA[7]
0V
TP197
TP188
TP219
C173
C104
U15
LAN91C113I-NE
LAN
XTAL1
127
XTAL2
128
AEN
41
nRD
31
nWR
32
INTR0
29
RESET
30
nLDEV
45
ARDY
38
nSRDY
43
nVLBUS
40
W/nR
36
nRDYRTN
46
nCYCLE
35
nADS
37
LCLK
42
VDD(nDATACS)
34
VDD(nBE3)
97
VDD(nBE2)
96
nBE1
95
nBE0
94
A1
78
A2
79
A3
80
A4
81
A5
82
A6
83
A7
84
A8
85
A9
86
A10
87
A11
88
A12
89
A13
90
A14
91
A15
92
D0
107
D1
106
D2
105
D3
104
D4
102
D5
101
D6
100
D7
99
D8
76
D9
75
D10
74
D11
73
D12
71
D13
70
D14
69
D15
68
D16
66
VDD(D17)
65
VDD(D18)
64
VDD(D19)
63
VDD(D20)
61
VDD(D21)
60
VDD(D22)
59
VDD(D23)
58
VDD(D24)
56
VDD(D25)
55
VDD(D26)
54
VDD(D27)
53
VDD(D28)
51
VDD(D29)
50
VDD(D30)
49
VDD(D31)
48
nCSOUT
2
X25OUT
47
nLNK
20
LBK
21
nCNTRL
28
RBIAS
12
TPO+
14
TPO-
15
TPI+
17
TPI-
18
nLEDA
22
nLEDB
23
RXD0
124
RXD1
123
RXD2
122
RXD3
121
TXD0
116
TXD1
115
TXD2
114
TXD3
113
TXEN100
111
CRS100
119
COL100
112
RX_DV
125
RX_ER
126
MDI
25
MDO
26
MCLK
27
RX25
118
TX25
109
IOS0
3
IOS1
4
IOS2
5
ENEEP
6
EEDO
7
EEDI
8
EESK
9
EECS
10
AVDD11
11
AVDD16
16
AGND13
13
AGND19
19
VDD1
1
VDD33
33
VDD44
44
VDD62
62
VDD77
77
VDD98
98
VDD110
110
VDD120
120
GND24
24
GND39
39
GND52
52
GND57
57
GND67
67
GND72
72
GND93
93
GND103
103
GND108
108
GND117
117
C181
C103
0V
TP217
0V
R131
220
X4
AT-49 25.00MHZ
C174
C104
0V
C187
C102
TP211
0V
TP204
VDD3
R154
49.9
1%(F)
(1608)
C168
C103
TP224
IF_FG4
TP202
R147
49
1%(F) (1608)
TP192
C172
C103
C179
C103
(1608)
10%(B)
TP220
C191
C104
C180
C103
1-3B/4F/4D
ADR[23-1]
1-3C/5D/7D
IORDN
VDD3
TP194
TP201
R155
100
(1608)
1-1B/4F
DATA[15-0]
1-3C/5C
IOWEN
C176
C103
(1608)
TP205
TP193
0V
1-3C
LAN_RST
TP214
VDD3
1-1C
LAN_INT
VDD3
R152
49.9
(1608)
1%(F)
TP222
TP216
R145
49
1%(F)
(1608)
C178
C103
(1608)
0V
0V
R133
10k
C189
C104
TP218
0V
R132
10k
C170
C103
C182
C103
TP212
VDD3
TP190
R143
49
1%(F)
(1608)
R138
100
(1608)
VDD3
C169
C103
TP200
TP225
TP191
TP189
TP203
TP210
L3
(1608)
0
0V
R156
1k
R140
11k
C164
C10P
TP207
1-3C
LAN_CSN
R129
3.3k
R149
49
1%(F)
(1608)
TP199
C177
C103
(1608)
0V
R159
10k
TP198
TP215
TP213
TP187
C183
C103
R160
10k
C171
C10P
TP226
VDD3
3B
LEDA
3B
LEDB
2B
LEDA
2B
LEDB
TP233
TP232
TP234
TP229
TP231
TP235
TP185
TP186
TP221
TP209
TP196
AVDD3
AVDD3
RA18
10k
2
7
1
8
3
6
4
5
RA14
33
2
7
1
8
3
6
4
5
RA13
33
2
7
1
8
3
6
4
5
RA16
33
2
7
1
8
3
6
4
5
RA15
33
2
7
1
8
3
6
4
5
OT1
CN15
0810-1X1T-03
1 TCT
2 TD+
3 TD-
4 RD+
5 RD-
6 RCT
7 LED1_C
8 LED1_A
9 LED2
10 LED3
11 FG
12 FG
ACTIVE : YELLOW
LINK : GREEN
Fig. 3-9