82541ER Datasheet, PDF (13/48 Pages) Intel Corporation – 82541ER Gigabit Ethernet Controller

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82541ER Gigabit Ethernet Controller
Signal Descriptions
Signal Type Definitions
The signals of the 82541ER controller are electrically defined as follows:
Name
I
O
TS
STS
OD
A
P
Definition
Input. Standard input only digital signal.
Output. Standard output only digital signal.
Tri-state. Bi-directional tri-state digital input/output signal.
Sustained Tri-state. An active low tri-state signal owned and driven by only one agent at a
time. The agent that drives an STS pin low must drive it high for at least one clock before letting
it float. A new agent cannot start driving an STS signal any sooner than one clock after the
previous owner tri-states it. A pullup is required to sustain the inactive state until another agent
drives it, and must be provided by the central resource.
Open Drain. Wired-OR with other agents.
The signaling agent asserts the OD signal, but the signal is returned to the inactive state by a
weak pull-up resistor. The pull-up resistor may require two or three clock periods to fully restore
the signal to the de-asserted state.
Analog. PHY analog data signal.
Power. Power connection, voltage reference, or other reference connection.
PCI Bus Interface Signals (56)
When the Reset signal (RST#) is asserted, the 82541ER will not drive any PCI output or bi-
directional pins.
Datasheet
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