RTL8019AS Datasheet, PDF (17/50 Pages) List of Unclassifed Manufacturers – Realtek Full-Duplex Ethernet Controller with Plug and Play Function (RealPNP)

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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
2001-05-10