AM79C989JCT Advanced Micro Devices, AM79C989JCT Datasheet - Page 10

• Manufacturer Part Number: AM79C989JCT
• Description: Quad Ethernet Switching Transceiver (QuEST)
• Manufacturer: Advanced Micro Devices

PIN DESCRIPTIONS
10BASE-T Signal Pins
TXD0
10BASE-T Transmit Data Port 0
Output
TXD0 are the 10BASE-T differential data drivers for
port 0.
RXD0
10BASE-T Receive Data Port 0
Input
RXD0 are the 10BASE-T differential data receivers for
port 0.
TXD1
10BASE-T Transmit Data Port 1
Output
TXD1 are the 10BASE-T differential data drivers for
port 1.
10
QuASI Interface (Continued)
Management Interface
Miscellaneous Pins
Power Pins
Pin Number
29, 23, 17
26, 20
42
43
40
41
44
39
14
34
6
7
8
1
9
QRST/STRB
QRX_CRS
Pin Name
VSSAUI
QCLSN
VDDTX
VSSRX
VSSTX
VDDIO
VSSIO
MDIO
SCLK
REXT
MDC
VDD
VSS
Pin Type
Output
VDD1
P R E L I M I N A R Y
Input
Input
Input
Input
VDD
VSS
VDD
VSS
VSS
VSS
VSS
I/O
I/O
Am79C989
Multiplexed collision error
PHYAD 2 internal address input upon reset
Multiplexed receive carrier sense
Management Interface Clock
Management Interface Data
System Clock for QuASI Interface
Active Low -- Reset and QuASI Channel 0 strobe
External resistor for determining TXD drive levels
1 VDD pin for digital Outputs
1 VSS pin for digital Inputs/Outputs
1 VDD pin for internal digital logic
1 VSS pin for internal digital logic
1 Analog VSS pin for AUI circuit
2 Analog VSS pins for TXD driver
1 Analog VSS pin for 10BASE-T Receivers
3 Analog VDD pins for TXD driver
(3.3 Volt Capable)
RXD
10BASE-T Receive Data Port 1
Input
RXD1 are the 10BASE-T differential data receivers for
port 1.
TXD2
10BASE-T Transmit Data Port 2
Output
TXD2 are the 10BASE-T differential data drivers for
port 2.
RXD2
10BASE-T Receive Data Port 2
Input
RXD2 are the 10BASE-T differential data receivers for
port 2.
TXD3
10BASE-T Transmit Data Port 3
Output
TXD3 are the 10BASE-T differential data drivers for
port 3.
Pin Description