am79c961 Advanced Micro Devices, am79c961 Datasheet - Page 32

• Manufacturer Part Number: am79c961
• Description: Pcnettm-isa Jumperless Single-chip Ethernet Controller For Isa
• Manufacturer: Advanced Micro Devices

selection: automatic selection, software selection, and
jumper selection of AUI or 10BASE-T interface.
In the automatic selection mode, the PCnet-ISA
troller will select the interface that is connected to the
network by checking the Link Status state machine. If
1-506
Bus
ISA
AMD
24-Bit System
System Data
Address
16-Bit
SD[0-15]
SA[0-15]
SMAM
SHFBUSY
BPAM
VCC
PCnet-ISA+
Controller
PRAB(0:15)
Shared Memory Block Diagram
SRWE
Plug and Play Compatible
P R E L I M I N A R Y
PRDB[2]/EEDO
PRDB[0]/EESK
PRDB[1]/EEDI
+
con-
PRDB[0-7]
Am79C961
SROE
BPCS
EECS
both AUI and 10BASE-T interfaces are connected, the
10BASE-T interface is selected over AUI. If the
PCnet-ISA
of network interface, it will read the PORTSEL [1:0] bits
in the Mode register (CSR15.8 and CSR15.7) to deter-
mine which interface needs to be activated.
+
controller is initialized for software selection
2
1
0
BPAM
SMAM
SA[16]
LA[17-23]
MEMCS16
DO
DI
SK
CS
A[0-15]
CE
OE
D[0-7]
A[0-15]
D[0-7]
WE
External
EEPROM
Logic
Glue
PROM
SRAM
Boot
SHFBUSY
ORG
CLK
SIN
OE
CS
18183B-9
V
CC