82545GM Просмотр технического описания (PDF) - Intel
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82545GM Datasheet PDF : 55 Pages
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Networking Silicon — 82545GM
3.2.7
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 120 K with a minimum of 90 K and a
maximum of 190 K.
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 120 K with a minimum of 90 K and a
maximum of 190 K.
3.2.8
SMB Signals
Note: A pull-up resistor with a recommended value of 4.7 K should be placed along the SMB. A
precise value may be calculated from the SMB specification.
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.
3.3
EEPROM Interface Signals
Symbol
EE_DI
EE_DO
EE_CS
EE_SK
Type
Name and Function
O
EEPROM Data Input. The EEPROM Data Input pin is used for output to the memory
device.
I
EEPROM Data Output. The EEPROM Data Output pin is used for input from the
memory device. The EE_DO includes an internal pull-up resistor.
O
EEPROM Chip Select. The EEPROM Chip Select signal is used to enable the device.
O
EEPROM Serial Clock. The EEPROM Shift Clock provides the clock rate for the
EEPROM interface, which is approximately 1 MHz.
Datasheet
13
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