GD82541PI datasheet(14/46 Pages) INTEL

14 / 46 page

82541(PI/GI/EI) — Networking Silicon

3.2.5

Error Reporting Signals (2)

3.2.6

Power Management Signals (3)

3.2.7

SMB Signals (3)

Note:

If the SMB is disconnected, then an external pull-up resistor should be used for these pins.

Symbol

Type

Name and Function

SERR#

System Error. The System Error signal is used by the 82541(PI/GI/EI) controller to

report address parity errors. SERR# is open drain and is actively driven for a single PCI

clock when reporting the error.

PERR#

STS

Parity Error. The Parity Error signal is used by the 82541(PI/GI/EI) controller to report

data parity errors during all PCI transactions except by a Special Cycle. PERR# is

sustained tri-state and must be driven active by the 82541(PI/GI/EI) 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.

Symbol

Type

Name and Function

LAN_

PWR_GOOD

Power Good (Power-on Reset). The LAN_PWR_GOOD signal is used to indicate

that stable power is available for the 82541(PI/GI/EI). When the signal is low, the

82541(PI/GI/EI) holds itself in reset state and floats all PCI signals.

PME#

Power Management Event. The 82541(PI/GI/EI) 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.

AUX_PWR

Auxiliary Power. If the Auxiliary Power signal is high, then auxiliary power is

available and the 82541(PI/GI/EI) device should support the D3cold power state.

Symbol

Type

Name and Function

SMBCLK

SMB Clock. The SMB Clock signal is an open drain signal for serial SMB

interface.

SMBDATA

SMB Data. The SMB Data signal is an open drain signal for serial SMB

interface.

SMB_ALERT#/

LAN_PWR_

GOOD

Multiplexed pin: SMB Alert, LAN Power Good. The SMB_ALERT# signal is

open drain for serial SMB interface. The signal acts as an interrupt pin of a slave

device on the SMBUS in TCO mode. (82559 mode).

In ASF mode, this signal acts as LAN_PWR_GOOD input.

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