Figure 3. typical isa bus connection diagram, Cs8900a, Crystal lan™ ethernet controller – Cirrus Logic CS8900A User Manual
Page 11: Cirrus logic product datasheet, And t, 3 ω 8.0 ω t
DS271F5
11
CS8900A
Crystal LAN™ Ethernet Controller
CIRRUS LOGIC PRODUCT DATASHEET
EECS
EEDATAOUT
EESK
SA[0:19]
MEMW
MEMR
IOW
IOR
REFRESH
SBHE
SD[0:15]
INTRQ0
INTRQ1
RXD-
RXD+
TXD-
TXD+
DO-
DO+
CI-
CI+
DI-
DI+
LANLED
LINKLED
CSOUT
EEDATAIN
AEN
RESET
INTRQ2
INTRQ3
DMARQ0
DMACK0
DMARQ1
DMACK1
DMARQ2
DMACK2
MEMCS16
IOCHRDY
T
c
1
3
6
8
1%
T
r1
1%
92
91
88
87
100
Ω, 1%
RJ45
16
14
11
9
6
3
2
1
1:1
1
4
5
8
84
82
81
79
16
13
12
9
10
10
9
2
5
83
80
2
7
15
3
12
1:1
1:1
0.1
μF
680
Ω
680
Ω
CE
OE
OE
DIR
20
22
19
1
74LS245
XTAL
1
XTAL
2
SLEEP
TEST
RES
CS
DO
DI
CLK
1
3
2
4
3
5
4
6
93C46
28
62
61
29
7
IRQ10
IRQ11
IRQ12
IRQ5
DRQ5
DACK5
DRQ6
DACK6
DRQ7
DACK7
16
20
SA[0:19]
LA[20:23]
BALE
4
97
98
93
4.99 k
Ω, 1%
12 V
4, 6
20 MHz
0.1
μF
39.2
Ω, 1%
5 V
4.7 k
Ω
CS8900A
CHIPSEL
IOCS16
49
63
75
36
34
64
33
32
30
35
31
15
13
14
16
11
12
99
100
17
39.2
Ω, 1%
39.2
Ω, 1%
39.2
Ω, 1%
EEPROM
Address
Decoder
PAL
27C256
ELCS
ISA
BUS
10 BASE T
Isolation
Transformer
1:1
15 pin D
AUI Isolation
Transformer
BSTATUS/HCI
Boot-PROM
PD[0:7]
SA[0:14]
SD[0:7]
15
8
5 V
13
77
76
78
0.1
μF
7
T
r2
TTR
Figure 3. Typical ISA Bus Connection Diagram
5 Volt
3 Volt
TTR
1 : 1.414
1 : 2.5
T
r1
and T
r2
24.3
Ω
8.0
Ω
T
c
69 pF
560 pF