RTL8100B(L)
2001-11-9
Rev.1.41
6
4. Pin Description
4.1 Power Management/Isolation Interface
Symbol
Type
Pin No
Description
PMEB
(PME#)
O/D
57
Power Management Event: Open drain, active low. Used by the
RTL8100B(L) to request a change in its current power management
state and/or to indicate that a power management event has occurred.
ISOLATEB
(ISOLATE#)
I
74
Isolate Pin: Active low. Used to isolate the RTL8100B(L) from the PCI
bus. The RTL8100B(L) does not drive its PCI outputs (excluding
PME#) and does not sample its PCI input (including RST# and
PCICLK) as long as the Isolate pin is asserted.
LWAKE
O
64
LAN WAKE-UP Signal: This signal is used to inform the motherboard
to execute the wake-up process. The motherboard must support
Wake-On-LAN (WOL). There are 4 choices of output, including active
high, active low, positive pulse, and negative pulse, that may be asserted
from the LWAKE pin. Please refer to the LWACT bit in the CONFIG1
register and the LWPTN bit in the CONFIG4 register for the setting of
this output signal. The default output is an active high signal.
Once a PME event is received, the LWAKE and PMEB assert at the
same time when the LWPME (bit4, CONFIG4) is set to 0. If the
LWPME is set to 1, the LWAKE asserts only when the PMEB asserts
and the ISOLATEB is low.
This pin is a 3.3V signaling output pin.
4.2 PCI Interface
Symbol
Type
Pin No
Description
AD31-0
T/S
86,87,89,91-95,100,
1,3-5,8-10,23-30,33,
36-38,41,42,44,45
PCI Address and Data Multiplexed Pins
C/BE3-0
T/S
98,11,21,32
PCI bus command and byte enables multiplexed pins.
CLK
I
83
Clock: This PCI Bus clock provides timing for all transactions and bus
phases, and is input to PCI devices. The rising edge defines the start of
each phase. The clock frequency ranges from 0 to 40MHz. For normal
network operation, the RTL8100B(L) requires a minimum PCI clock
frequency of 16.75MHz.
DEVSELB
S/T/S
15
Device Select: As a bus master, the RTL8100B (L) samples this signal
to insure that a PCI target recognizes the destination address for the data
transfer. As a target, the RTL8100B(L) asserts this signal low when it
recognizes its target address after FRAMEB is asserted.
FRAMEB
S/T/S
12
Cycle Frame: As a bus master, this pin indicates the beginning and
duration of an access. FRAMEB is asserted low to indicate the start of a
bus transaction. While FRAMEB is asserted, data transfer continues.
When FRAMEB is deasserted, the transaction is in the final data phase.
As a target, the device monitors this signal before decoding the address
to check if the current transaction is addressed to it.
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