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RTL8139C

REALTEK 3.3V SINGLE CHIP FAST ETHERNET CONTROLLER WITH POWER MANAGEMENT

Realtek Semiconductor 

RTL8139C(L)

6.11 CONFIG 1: Configuration Register 1

(Offset 0052h, R/W)

Bit

R/W

Symbol

Description

7-6

R/W

LEDS1-0 Refer to LED PIN definition. These bits’ initial value come from 93C46/93C56.

5

R/W

DVRLOAD Driver Load: Software may use this bit to make sure that the driver has been

loaded. Writing 1 is 1. Writing 0 is 0. When the command register bits IOEN,

MEMEN, and BMEN of the PCI configuration space are written, the

RTL8139C(L) will clear this bit automatically.

4

R/W

LWACT LWAKE active mode: The LWACT bit and LWPTN bit in the CONFIG4

register are used to program the LWAKE pin’s output signal. According to the

combination of these two bits, there may be 4 choices of LWAKE signal, i.e.,

active high, active low, positive (high) pulse, and negative (low) pulse. The

output pulse width is about 150 ms. In CardBus applications, the LWACT and

LWPTN have no meaning.

The default value of each of these two bits is 0, i.e., the default output signal of

the LWAKE pin is an active high signal.

LWAKE output

LWACT

0

1

0

Active high*

Active low

LWPTN

1

Positive pulse

Negative pulse

* Default value.

3

R

MEMMAP Memory Mapping: The operational registers are mapped into PCI memory space.

2

R

IOMAP

I/O Mapping: The operational registers are mapped into PCI I/O space.

1

R/W

VPD

Vital Product Data: This is used to set to enable Vital Product Data. The VPD

data is stored in 93C46 or 93C56 from within offset 40h-7Fh.

0

R/W

PMEn

Power Management Enable:

Write able only when 93C46CR register EEM1=EEM0=1

Let A denote the New_Cap bit (bit 4 of the Status Register) in the PCI

Configuration space offset 06H.

Let B denote the Cap_Ptr register in the PCI Configuration space offset 34H.

Let C denote the Cap_ID (power management) register in the PCI Configuration

space offset 50H.

Let D denote the power management registers in the PCI Configuration space

offset from 52H to 57H.

Let E denote the Next_Ptr (power management) register in the PCI

Configuration space offset 51H.

PMEn Description

0 A=B=C=E=0, D not valid

1 A=1, B=50h, C=01h, D valid, E=0

2002/01/10

21

Rev.1.4

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