LS009.0
1997.01.16
RTL8029AS Preliminary
9
[56]
[EEDI]
O
9346 serial data input
[55]
[EEDO]
I
9346 serial data output
40-47
MD7-0
I/O
Boot ROM data bus
4.5. Medium Interface Pins
No.
Name
Type
Description
82, 81
CD+,CD-
I
This AUI collision input pair carries the differential
collision input signal from the MAU.
84, 83
RX+,RX-
I
This AUI receive input pair carries the differential receive
input signal from the MAU.
77, 76
TX+,TX-
O
This AUI transmit output pair contains differential line
drivers which send Manchester encoded data to the MAU.
These outputs are source followers and require 270 ohm
pull-down resistors to GND.
87, 86
TPIN+,TPIN-
I
This TP input pair receives the 10 Mbits/s differential
Manchester encoded data from the twisted-pair wire.
73, 74
TPOUT+,TPOUT-
O
This pair carries the differential TP transmit output. The
output Manchester encoded signals have been pre-distorted
to prevent overcharge on the twisted-pair media and thus
reduce jitters.
78
X1
I
20Mhz crystal or external oscillator input.
79
X2
O
Crystal feedback output. This output is used in crystal
connection only. It must be left open when X1 is driven with
an external oscillator.
4.6. LED Output Pins
No.
Name
Type
Description
71
LED_BNC
O
This pin goes high when RTL8029AS's medium type is set
to 10Base2 mode or auto-detect mode with link test failure.
Otherwise, this pin is low. This pin can be used to control
the power of the DC converter for CX MAU and connected
to an LED to indicate the used medium type.
70
LED0
O
When LEDS0 bit (in CONFIG3 register of
RTL8029AS
Page3) is 0, this pin acts as LED_COL. When LEDS0=1, it
acts as LED_LINK.
69, 68
LED1,LED2
O
When LEDS1 bit (in CONFIG3 register of RTL8029AS
Page3) is 0, these 2 pins act as LED_RX & LED_TX
respectively. When LEDS1=1, these pins act as LED_CRS
& MCSB. Please refer to section 6.5 for details of the
lightening behavior of all LEDs.
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