AM79C976 Advanced Micro Devices, AM79C976 Datasheet - Page 31

• Manufacturer Part Number: AM79C976
• Description: PCnet-PRO 10/100 Mbps PCI Ethernet Controller
• Manufacturer: Advanced Micro Devices

Note: The SFBD signal can be programmed to appear
on any of the LED pins.
RXFRTGD
Receive Frame Tag Data
When the EADI is enabled (EADISEL, BCR2, bit 3) and
the Receive Frame Tagging is enabled (RXFRTG,
CSR7, bit 14), the RXFRTGD pin becomes a data input
pin for the Receive Frame Tag. See the Receive Frame
Tagging section for details.
Note: The RXFRTGD pin is multiplexed with the LED3
and EEDO pins.
RXFRTGE
Receive Frame Tag Enable
When the EADI is enabled (EADISEL, BCR2, bit 3) and
the Receive Frame Tagging is enabled (RXFRTG,
CSR7, bit 14), the RXFRTGE pin becomes a data input
enable pin for the Receive Frame Tag. See the Receive
Frame Tagging section for details.
Note: The RXFRTGE pin is multiplexed with the LED2
pin.
IEEE 1149.1 (1990) Test Access Port
Interface
TCK
Test Clock
TCK is the clock input for the boundary scan test mode
operation. It can operate at a frequency of up to 10
MHz. TCK has an internal pull-up resistor.
TDI
Test Data In
TDI is the test data input path to the Am79C976 con-
troller. The pin has an internal pull-up resistor.
8/01/00
P R E L I M I N A R Y
Input
Input
Input
Input
Am79C976
TDO
Test Data Out
TDO is the test data output path from the Am79C976
controller. The pin is tri-stated when the JTAG port is in-
active.
TMS
Test Mode Select
A serial input bit stream on the TMS pin is used to
define the specific boundary scan test to be executed.
The pin has an internal pull-up resistor.
Power Supply Pins
AVDD
Analog Power (1 Pin)
This power supply pin is used for the internal oscillator
and phase-locked loop circuits. This pin must be
connected to a +3.3-V supply.
VSSB
I/O Buffer Ground (25 Pins)
There are 25 ground pins that are used by the input/
output buffer drivers.
VDD
Digital and I/O Buffer Power (24 Pins)
There are 24 power supply pins that are used by the in-
ternal digital circuitry and I/O buffers. All VDD pins must
be connected to a +3.3 V supply.
VSS
Digital Ground (8 Pins)
There are eight ground pins that are used by the inter-
nal digital circuitry.
Output
Power
Power
Power
Power
Input
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