8019AS.doc
2001-05-10
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SPECIFICATION
RTL8019AS
21
BROM size
BA14
BA15
16K
high
high
32K
SA14
high
64K
SA14
SA15
CONFIG3: RTL8019AS Configuration Register 3 (06H; Type=R except Bit[2:1]=R/W)
Bit
Symbol
Description
7
PNP
This bit is negligible in jumper mode. In jumperless mode it, when set, indicates the
RTL8019AS is operating in Plug and Play mode. This bit is set when the PNP pin is
high or the PNP bit in 9346 is set in jumperless mode.
6
FUDUP
When this bit is set, RTL8019AS is set to the full-duplex mode which enables
simultaneously transmission and reception on the twisted-pair link to a full-duplex
Ethernet switching hub. This feature not only increases the channel bandwidth from
10 to 20 Mbps but also avoids the performance degrading problem due to the channel
contention characteristics of the Ethernet CSMA/CD protocol.
5-4
LEDS1-0
These two bits select the outputs to LED2-0 pins.
LEDS0
LED0 Pin
0
LED_COL
1
LED_LINK
LEDS1
LED1 Pin
LED2 Pin
0
LED_RX
LED_TX
1
LED_CRS
MCSB
Please refer to section 6.5 for the behavior of LEDs.
The MCSB signal is defined to put the local buffer SRAM into standby mode while
DMA is not in progress and thus save powers.
3
-
Reserved. Must not write a 1 to this bit.
2
SLEEP
This bit, when set, puts RTL8019AS into sleep mode.
In sleep mode, all LED signals (P.S. MCSB is not an LED signal) except LEDBNC
are forced high to turn off the LEDs. The RTL8019AS still handles the network
transmission and reception like in normal mode. The LEDBNC is not affected by this
bit.
This bit's power-up initial value is 0 and can be modified by software when
EEM1=EEM0=1.
1
PWRDN
This bit , when set, puts RTL8019AS into power down mode.
RTL8019AS supports two kinds of power down modes, which is selected by the
contents of the HLTCLK register:
(1) mode 1: power down with clock running
(2) mode 2: power down with clock halted
In both power down modes, the RTL8019AS's serial network interface and transceiver
are turned off. All network activities are ignored.
All LED signals except LEDBNC are forced high. The LEDBNC is forced low to
disable the DC convertor for coaxial transceiver.
In power down mode2, the RTL8019AS stops its internal clock for minimal power
consumption. Registers except HLTCLK are typically not accessible in this mode.
This bit's initial value comes from 9346 and can be modified if EEM1=EEM0=1 in
9346CR register.
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