RTL8029AS Ver la hoja de datos (PDF) - Realtek Semiconductor

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RTL8029AS

Realtek PCI Full-Duplex Ethernet Controller with built-in SRAM

Realtek Semiconductor 

RTL8029AS Preliminary

Page3 Content Descriptions

9346CR: 9346 Command Register (01H; Type=R/W except Bit0=R)

Bit

Symbol

Description

7-6 EEM1-0 These 2 bits select the RTL8029AS operating mode.

EEM1

0

0

1

1

EEM0

0

1

0

1

Operating Mode

Normal (DP8390 compatible)

Auto-load:

Entering this mode will make the RTL8029AS

load the contents of 9346 like when the RSTB

signal is asserted.

This auto-load operation will take about 2ms.

After it is completed, the RTL8029AS goes back

to the normal mode automatically (EEM1=EEM0

=0) and the CR register is reset to 21H.

9346 programming:

In this mode, both the local & remote DMA

operations of 8390 are disabled. The 9346 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 the Page3 CONFIG2,3

registers, the RTL8029AS must be placed in this

mode. This will prevent RTL8029AS's

configurations from accidental change.

5-4

-

Not used.

3

EECS

These bits reflect the state of EECS, EESK, EEDI & EEDO pins in auto-load or

2

EESK 9346 programming mode.

1

EEDI

0

EEDO

CONFIG0: RTL8029AS Configuration Register 0 (03H; Type=R)

Bit

Symbol

Description

7-3

-

Not used

2

BNC When set, this bit indicates that the RTL8029AS is using the 10Base2 thin cable

as its networking medium. This bit will be set in the following 2 cases:

(1) PL1=PL0=0 (auto-detect) and link test fails

(2) PL1=PL0=1 (10 Base 2)

1-0

-

Always 0s.

CONFIG1: Reserved

CONFIG2: RTL8029AS Configuration Register 2 (05H; Type=R except Bit[7:5]=R/W)

Bit

Symbol

Description

7-6

PL1-0 Select network medium types.

LS009.0

18

1997.01.16

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