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參數(shù)資料
| 型號： | RTL8019AS |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Realtek Full-Duplex Ethernet Controller with Plug and Play Function (RealPNP) |
| 中文描述： | 瑞昱全雙工以太網(wǎng)控制器即插即用功能（RealPNP） |
| 文件頁數(shù)： | 8/50頁 |
| 文件大?。?/td> | 992K |
| 代理商： | RTL8019AS |
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8019AS.doc
2001-05-10
·R￥bééa￥÷|3--¤￥q
SPECIFICATION
RTL8019AS
8
*Note: RTL8019AS doesn't drive BA14-21 until the SMEMRB goes from high to low.
4.4.
Medium Interface Pins
No.
Name
Type
Description
64
AUI
I
This input is used to detect the usage of an external MAU on
the AUI interface. The input should be driven low for
embedded BNC and high for external MAU. When the input
is high, RTL8019AS sets the AUI bit (bit5) in CONFIG0
and drives LEDBNC low to disable the BNC. If this pin is
not used, it should be connected to GND such that
RTL8019AS acts like RTL8019. Please refer to section
5.1.2.2. CONFIG0 for more details.
54,53
CD+,CD-
I
This AUI collision input pair carries the differential
collision input signal from the MAU.
56,55
RX+,RX-
I
This AUI receive input pair carries the differential receive
input signal from the MAU.
49,48
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.
59,58
TPIN+,
TPIN-
I
This TP input pair receives the 10 Mbits/s differential
Manchester encoded data from the twisted-pair wire.
45,46
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 jitter.
50
X1
I
20Mhz crystal or external oscillator input.
51
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.
4.5. LED Output Pins
No.
Name
Type
Description
60
LEDBNC
O
This pin goes high when RTL8019AS'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 convertor for CX MAU and connected
to an LED to indicate the used medium type.
61
LED0
O
When LEDS0 bit (in CONFIG3 register of RTL8019AS
Page3) is 0, this pin acts as LED_COL. When LEDS0=1, it
acts as LED_LINK.
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