am79c989 Advanced Micro Devices, am79c989 Datasheet - Page 28

• Manufacturer Part Number: am79c989
• Description: Quad Ethernet Switching Transceiver
• Manufacturer: Advanced Micro Devices

SYSTEM APPLICATIONS
10 Mbps Ethernet Switch
The QuEST device is targeted for use in 10BASE-T
switching applications. The QuEST device provides
four 10BASE-T receive and transmit ports.
28
Note: If QINT and the AUI port are used
10K resistors are used to set internal address match for Management Address.
RCV_DATA
Interface
RCV_CRS
Switch
TX_DATA
RCV_DV
RESET
TX_EN
CLSN
SCLK
MDIO
MDC
INT
VDD VDD
Signals
Shared
Figure 1. QuEST Device Application Diagram
VDD
VDD
VDD
P R E L I M I N A R Y
,
REXT
QTX_EN
QTX_DATA
QRX_DATA
QRX_VALID
QCLSN
QRX_CRS
SCLK
QRST/STRB
QINT
MDC
MDIO
a special circuit (not shown) is needed for PCI. Optional
Am79C989
QuEST
or
PCI/CI+
RXD0+
RXD1+
RXD2+
RXD3+
TXD0+
TXD1+
TXD2+
TXD3+
RXD0-
RXD1-
RXD2-
RXD3-
TXD0-
TXD1-
TXD2-
TXD3-
Optionally, one of the 10BASE-T ports can be repro-
grammed as an AUI. The four Ethernet ports are multi-
plexed into the QuASI interface which interfaces to a
switching subsystem. The QuEST device provides
10BASE-T filterless technology and a reduced pin
count which enables high levels of switch integration.
DO+
DO-
DI+
CI-
DI-
110
100
110
100
110
100
110
100
40.2
40.2
40.2
40.2
0.01 F to
0.01 F to
10.1 F
10.1 F
1:1
1:1
1:1
1:1
1:1
1:1
1:1
1:1
1:1
1:1
1:1
RJ45 Connector
RJ45 Connector
RJ45 Connector
RJ45 Connector
AUI Connector
(Optional)
21173B-5