am79c981 Advanced Micro Devices, am79c981 Datasheet - Page 2

• Manufacturer Part Number: am79c981
• Description: Integrated Multiport Repeater Plus? Imr+? ??9
• Manufacturer: Advanced Micro Devices

For application examples on building a fully managed
repeater using the IMR+ and HIMIB devices, refer to
AMD’s IEEE 802.3 Repeater Technical Manual
(PID#17314A) and the ISA-HUB
(PID # 17642A).
BLOCK DIAGRAM
RELATED AMD PRODUCTS
1–72
Part No.
Am79C98
Am79C100
Am7996
Am79C987
Am79C940
Am7990
Am79C90
Am79C900
Am79C960
Am79C961
Am79C965
Am79C970
Am79C974
RXD
RXD
TXD
TXP
TXD
TXP
DO
RST
DI
CI
X 2
X 1
AMD
Reset
Clock
Gen
AUI
Port
Port
Port
TP
TP
Description
Twisted Pair Ethernet Transceiver (TPEX)
Twisted Pair Ethernet Transceiver Plus (TPEX+)
IEEE 802.3/Ethernet/Cheapernet Transceiver
Hardware Implemented Management Information Base
Media Access Controller for Ethernet (MACE )
Local Area Network Controller for Ethernet (LANCE)
CMOS Local Area Network Controller for Ethernet (C-LANCE)
Integrated Local Area Communications Controller
PCnet-ISA Single-Chip Ethernet Controller (for ISA bus)
PCnet-ISA
PCnet-32 Single-Chip 32-Bit Ethernet Controller
PCnet-PCI Single-Chip Ethernet Controller (for PCI bus)
PCnet-SCSI Combination Ethernet and SCSI Controller for PCI Systems
0
7
+
Single-Chip Ethernet Controller for ISA (with Microsoft Plug n’ Play Support)
MUX
RX
TM
User Manual
Manchester
Encoder
Manchester
PRELIMINARY
Phase =
Locked
Decoder
Loop
Am79C981
IMR+ Chip
Partitioning
Link Test
Control
Timers
The device is fabricated in CMOS technology and re-
quires a single +5 V supply.
(ILACC )
(HIMIB )
Control
FIFO
FIFO
Jam Sequence
Preamble
Expansion Port
Management
Test
Port
and
MUX
TX
17306B-1
REQ
STR
ACK
COL
SI
SO
TEST
CRS
DAT
JAM
SCLK