CS8900A
Crystal LAN™ Ethernet Controller
20 MHz
5 V
Ω
4.99 k , 1%
Ω
4.7 k
10 BASE T
Isolation
Transformer
97
98
77
76
93
EEPROM
93C46
XTAL XTAL
SLEEP
TEST RES
RXD-
RJ45
1
2
1
4
3
2
3
6
5
4
92
1
16
6
CS
DO
DI
EECS
1:1
Ω, 1%
100
Tc
EEDATAIN
EEDATAOUT
EESK
91
88
3
14
11
3
2
RXD+
TXD-
1%
1%
Tr1
CLK
6
7
8
TTR
87
9
1
ISA
TXD+
Address
Decoder
PAL
BUS
12 V
Tr2
µ
F
0.1
4
7
LA[20:23]
CHIPSEL
ELCS
CS8900A
15 pin D
AUI Isolation
Transformer
13
BALE
20
84
83
82
81
80
79
1
2
4
5
7
8
16 10
SA[0:19]
SA[0:19]
MEMW
DO-
DO+
CI-
1:1
1:1
1:1
28
29
62
61
49
36
63
75
34
33
64
15
13
12
3
9
2
MEMR
IOW
CI+
DI-
10 12
IOR
9
5
REFRESH
SBHE
DI+
4, 6
Ω
39.2 , 1%
39.2 , 1%
Ω
Ω
39.2 , 1%
39.2 , 1%
Ω
AEN
µ
0.1
F
µ
F
0.1
RESET
MEMCS16
IOCS16
IOCHRDY
SD[0:15]
INTRQ0
INTRQ1
INTRQ2
INTRQ3
DMARQ0
DMACK0
DMARQ1
DMACK1
DMARQ2
DMACK2
78
BSTATUS/HCI
LANLED
5 V
Ω
Ω
680
680
100
16
32
31
30
35
15
16
13
14
11
12
IRQ10
IRQ11
IRQ12
IRQ5
99
17
LINKLED
CSOUT
74LS245
OE
Boot-PROM
27C256
19
1
DRQ5
DACK5
DRQ6
DACK6
DRQ7
DACK7
20
22
CE
OE
DIR
PD[0:7]
15
8
SA[0:14]
SD[0:7]
5 Volt
3 Volt
1 : 2.5
8.0 Ω
TTR
1 : 1.414
24.3 Ω
69 pF
T and T
r1
r2
T
560 pF
c
Figure 3. Typical ISA Bus Connection Diagram
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