82546EB Datasheet, PDF (17/47 Pages) Intel Corporation – Dual Port Gigabit Ethernet Controller

Networking Silicon — 82546EB
3.2.5
3.2.6
3.2.7
3.2.8
Error Reporting Signals
Symbol
SERR#
PERR#
Type
Name and Function
System Error. The System Error signal is used by the 82546EB controller to report
OD address parity errors. SERR# is open drain and is actively driven for a single PCI clock
when reporting the error.
Parity Error. The Parity Error signal is used by the 82546EB controller to report data
parity errors during all PCI transactions except by a Special Cycle. PERR# is sustained
STS tri-state and must be driven active by the 82546EB controller two data clocks after a
data parity error is detected. The minimum duration of PERR# is one clock for each
data phase a data parity error is present.
Power Management Signals
Symbol Type
Name and Function
PME#
OD
AUX_PWR I
Power Management Event. The 82546EB device drives this signal low when it
receives a wake-up event and either the PME Enable bit in the Power Management
Control/Status Register or the Advanced Power Management Enable (APME) bit of the
Wake-up Control Register (WUC) is 1b.
Auxiliary Power. If the Auxiliary Power signal is high, then auxiliary power is available
and the 82546EB device should support the D3cold power state.
Impedance Compensation Signals
Symbol Type
Name and Function
ZN_COMP I/O
ZP_COMP I/O
N Device Impedance Compensation. This signal should be connected to an external
precision resistor (to VDD) that is indicative of the PCI/PCI-X trace load. This cell is
used to dynamically determine the drive strength required on the N-channel transistors
in the PCI/PCI-X I/O cells.
The internal pull-up impedance is nominally 20 KΩ with a minimum of 15 KΩ.
P Device Impedance Compensation. This signal should be connected to an external
precision resistor (to VSS) that is indicative of the PCI/PCI-X trace load. This cell is
used to dynamically determine the drive strength required on the P-channel transistors
in the PCI/PCI-X I/O cells.
The internal pull-up impedance is nominally 20 KΩ with a minimum of 15 KΩ.
SMB Signals
Symbol Type
Name and Function
SMBCLK I/O
SMBDATA I/O
SMBALRT# O
SMB Clock. The SMB Clock signal is an open drain signal for serial SMB interface.
SMB Data. The SMB Data signal is an open drain signal for serial SMB interface.
SMB Alert. The SMB Alert signal is open drain for serial SMB interface.
Datasheet
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