RTL8139D Ver la hoja de datos (PDF) - Realtek Semiconductor

Número de pieza

componentes Descripción

fabricante

RTL8139D

SINGLE-CHIP MULTI-FUNCTION 10/100Mbps ETHERNET CONTROLLER WITH POWER MANAGEMENT

Realtek Semiconductor 

RTL8139DL

Datasheet

5.9. 9346CR: 93C46 Command Register

(Offset 0050h, R/W)

This register is used for issuing commands to the RTL8139D(L). These commands are issued by setting the

corresponding bits for the function. A warm software reset along with individual reset and enable/disable

for transmitter and receiver are provided as well.

Bit

R/W

Symbol

Description

7-6

R/W

EEM1-0

Operating Mode: These 2 bits select the RTL8139D(L) operating

mode.

EEM1

0

0

1

1

EEM0

0

1

0

1

Operating Mode

Normal (RTL8139D(L) network/host communication

mode)

Auto-load: Entering this mode will make the

RTL8139D(L) load the contents of 93C46 like when the

RSTB signal is asserted. This auto-load operation will

take about 2 ms. After it is completed, the RTL8139D(L)

goes back to the normal mode automatically (EEM1 =

EEM0 = 0) and all the other registers are reset to default

values.

93C46 programming: In this mode, both network and host

bus master operations are disabled. The 93C46 can be

directly accessed via bit3-0 which now reflect the states of

EECS, EESK, EEDI, & EEDO pins respectively.

Config register write enable: Before writing to CONFIG0,

1, 3, 4 registers, and bit13, 12, 8 of BMCR(offset

62h-63h), the RTL8139D(L) must be placed in this mode.

This will prevent RTL8139D(L)'s configurations from

accidental change.

4-5

-

3

R/W

2

R/W

1

R/W

0

R

-

EECS

EESK

EEDI

EEDO

Reserved

These bits reflect the state of EECS, EESK, EEDI & EEDO pins in

auto-load or 93C46 programming mode.

Single Chip Multifunction 10/100 Ethernet Controller w/Power Management 18 Track ID: JATR-1076-21 Rev. 1.2

Share Link: