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

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 RTL8019AS 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 RTL8019AS

load the contents of 9346 like when the

RSTDRV signal is asserted.

This auto-load operation will take about 2ms.

After it is completed, the RTL8019AS 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

operation 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 CONFIG1-3

registers, the RTL8019AS must be placed in this

mode. This will prevent RTL8019AS'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

BPAGE: BROM Page Register (02H; Type=R/W)

This register selects a BROM page to be read by the host. Totally it can select 256 pages with 16k

bytes per page. Thus the maximum BROM size is 256*16k=4M bytes.

8019AS.doc

17

2001-04-02

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