am79c961 Advanced Micro Devices, am79c961 Datasheet - Page 28

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

PIN DESCRIPTION:
NETWORK INTERFACES
AUI
CI+, CI–
Control Input
This is a differential input pair used to detect Collision
(Signal Quality Error Signal).
DI+, DI–
Data In
This is a differential receive data input pair to the PCnet-
ISA+ controller.
DO+, DO–
Data Out
This is a differential transmit data output pair from the
PCnet-ISA+ controller.
Twisted Pair Interface
RXD+, RXD–
Receive Data
This is the 10BASE-T port differential receive input pair.
TXD+, TXD–
Transmit Data
These are the 10BASE-T port differential transmit
drivers.
TXP+, TXP–
Transmit Predistortion Control Output
These are 10BASE-T transmit waveform pre-distortion
control differential outputs.
PIN DESCRIPTION:
IEEE 1149.1 (JTAG) TEST ACCESS PORT
TCK
Test Clock
This is the clock input for the boundary scan test mode
operation. TCK can operate up to 10 MHz. TCK does
not have an internal pullup resistor and must be con-
nected to a valid TTL level of high or low. TCK must not
be left unconnected.
TDI
Test Data Input
This is the test data input path to the PCnet-ISA
ler. If left unconnected, this pin has a default value of
HIGH.
1-502
AMD
Input
Input
Output
Input
Output
Input
Input
P R E L I M I N A R Y
+
control-
Am79C961
TDO
Test Data Output
This is the test data output path from the PCnet-ISA
controller. TDO is tri-stated when JTAG port is inactive.
TMS
Test Mode Select
This is a serial input bit stream used to define the spe-
cific boundary scan test to be executed. If left
unconnected, this pin has a default value of HIGH.
PIN DESCRIPTION:
POWER SUPPLIES
All power pins with a “D” prefix are digital pins connected
to the digital circuitry and digital I/O buffers. All power
pins with an “A” prefix are analog power pins connected
to the analog circuitry. Not all analog pins are quiet and
special precaution must be taken when doing board lay-
out. Some analog pins are more noisy than others and
must be separated from the other analog pins.
AVDD1–4
Analog Power (4 Pins)
Supplies power to analog portions of the PCnet-ISA
controller. Special attention should be paid to the printed
circuit board layout to avoid excessive noise on these
lines.
AVSS1–2
Analog Ground (2 Pins)
Supplies
PCnet-ISA
to the printed circuit board layout to avoid excessive
noise on these lines.
DVDD1–7
Digital Power (7 Pins)
Supplies power to digital portions of PCnet-ISA
ler. Four pins are used by Input/Output buffer drivers
and two are used by the internal digital circuitry.
DVSS1–13
Digital Ground (13 Pins)
Supplies
PCnet-ISA
put buffer drivers and two are used by the internal digital
circuitry.
+
+
ground reference to analog portions of
ground
controller. Special attention should be paid
controller. Ten pins are used by Input/Out-
reference to digital portions of
Output
Input
Power
Power
Power
Power
+
control-
+
+