8019AS.doc
2001-05-10
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SPECIFICATION
RTL8019AS
27
6. Functional Descriptions
6.1. RTL8019AS Configuration Modes
The RTL8019AS supports 3 configuration modes: jumper, RT jumperless, and PnP.
JP Pin
PnP Pin
9346 Content
Mode
CONFIG0
CONFIG3
PNP
ACTIVEB
JP
PNPJP
PNP
ACTIVEB
H
H
L
x
x
Jumper
1
1
0
0
0
L
H
x
a (a=0or1)
PnP
0
1
1
a
L
L
1
a (a=0or1)
PnP
0
0
1
a
L
L
0
x
RT jmpless
0
0
0
0
P.S. "x" denotes don't care.
The RTL8019AS's resource configuration informations such as I/O base address, BROM memory
base address, and interrupt request line, etc., are stored in the CONFIG3-0 registers in Group1
Page3 as well as the PnP logical device configuration registers. Their power-up default values may
come from the states of jumper pins in jumper mode or the contents of 9346 in PnP and RT
jumperless mode. Their values can be modified by software via the logical device configuration
registers in all 3 modes. The update values will be recorded to the CONFIG3-0 registers, too. This
new configuration is only valid temporarily and will be lost after an auto-load command, an active
RSTDRV, or PC power off . Permanent changes of configuration must be done by changing the
jumper states or the contents of 9346. Note that the BROM size can not be modified temporarily.
The Plug and Play logic can work in all the three configuration modes except that an RT defined
initiation key, named RT initiation key, should be used instead of the PnP initiation key. In other
words, the RT initiation key is supported in all configuration modes while the PnP initiation key is
only supported in the PnP mode. By using the RT initiation key, the software can put RTL8019AS
to the PnP Config state and access the logical device configuration registers even in the jumper and
RT jumperless modes.
Power up default ACTIVE state
In RTL8019, the ACTIVEB bit in 93C46 decides the power-up adapter status even in RT jumpless
mode. In the standard application when BROM is not enabled, the adapter should be power up
inactive in PnP mode and active in RT jumperless mode. However RTL8019's PnP jumper only
decides the jumperless mode. The adapter's "ACTIVE" status is not changed properly at the same
time when the user changes the PnP jumper state. This causes an application inconsistence when
PnP jumper is to be used.
In RTL8019AS, we change RTL8019's original specification into:
The ACTIVEB bit in 9346 is ignored when RTL8019AS is in jumper or RT jumperless mode.
The adapter's power-up status is always "ACTIVE" in RT jumperless mode. However, the
active status still can be changed via the PnP Activate register.
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