RTL8019AS Ver la hoja de datos (PDF) - Realtek Semiconductor

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RTL8019AS

Realtek Full-Duplex Ethernet Controller with Plug and Play Function (RealPNP)

Realtek Semiconductor 

SPECIFICATION

RTL8019AS

CONFIG2: RTL8019AS Configuration Register 2 (05H; Type=R except Bit[7:5]=R/W)

Bit

Symbol

Description

7-6

PL1-0 Select network medium types.

PL1 PL0

Medium Type

0

0 TP/CX auto-detect

(10BaseT link test is

enabled)

0

1 10BaseT with link test

disabled

1

0 10Base5

1

1 10Base2

5

BSELB This bit, when set, forces the BROM disabled regardless of the contents of BS4-0. Its

power-up initial value is 0 and can be modified by software if EEM1=EEM0=1 in

9346CR register.

4-0

BS4-0 These bits select the BROM size & memory base address.

BS4 BS3 BS2 BS1 BS0

BROM Base & size

00***

01000

01001

01010

01011

01100

01101

10000

10001

10010

10011

10100

10101

10110

10111

11000

11001

11010

11011

11100

11101

11110

11111

Disabled

C000h, 32K

C800h, 32K

D000h, 32K

D800h, 32K

C000h, 64K

D000h, 64K

C000h, 16K

C400h, 16K

C800h, 16K

CC00h, 16K

D000h, 16K

D400h, 16K

D800h, 16K

DC00h, 16K

C000h, Page

C400h, Page

C800h, Page

CC00h, Page

D000h, Page

D400h, Page

D800h, Page

DC00h, Page

The RTL8019AS supports a special BROM mode: page mode. In page mode, the

BROM always occupies 16K-byte host memory space. However the actual BROM size

can be up to 4M bytes.

The BROM is divided into several 16K-byte pages. The power on boot page is set to

page 0 and the program in page 0 is responsible to select the other pages by the BPAGE

register and load their programs.

In page mode, bits BP7-0 of BPAGE register are mapped to the BA21-14 pins to select

the proper BROM page. In other modes, BA21-16 are not used and the BA15-14

outputs are shown in the following table.

8019AS.doc

20

2001-04-02

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