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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)： | 42/50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
42
LED1 (LED_RX or LED_CRS)
RTL8019's LED_RX or LED_CRS LED sometimes keeps blinking when the media type of a 2-in-
1 (UTP+BNC) LAN adapter is set to auto-detect and both UTP and coaxial cable are not
connected. In the case, RTL8019 is actually using the BNC because the UTP link test fails. Many
8392 will falsely detect a carrier when the BNC inteface is not properly terminated (e.g. coaxial
cable is not connected). That carrier sense will then make RTL8019's LED_RX or LED_CRS blink.
The problem is that not all 8392s cause the LED blinking, which makes the phenomenon very
ambiguous. Considering the phenomenon is normally awared upon power on, we change
RTL8019's original function to solve the problem to some extent.
The new specification is:
The LED_RX or LED_CRS does not reflect the carrier sense when the CR register bit 0 is set (in
stop mode).
Thus, the false carrier due to cabling problem upon power on will not cause the LED1
to blink anymore.
LED Output States in Power Down Modes
LED Output
Normal Mode / Idle
Sleep Mode
LEDBNC
-
LED_LINK
-
LED_COL
High
LED_TX
Low
LED_RX
Low
LED_CRS
Low
6.6. Loopback Diagnostic Operation
6.6.1. Loopback operation
The RTL8019AS provides 3 loopback modes. By loopback test, we can verify the integrity of data
path, CRC logic, address recognition logic and cable connection status.
Mode 1:
Loopback through the NIC (LB1=0, LB0=1 in TCR).
The NRZ data is not transmitted to the SNI but instead it's loopbacked to the NIC's Rx
deserializer. The traffic on the cable is ignored.
Power Down Mode
Low
High
High
High
High
High
-
High
High
High
High
High
SNI
83910
NIC
8390
Ref:
Mode 2:
Loopback through the SNI (LB1=1, LB0=0 in TCR)
The Manchester encoded data is not transmitted to the MAU. It's loopbacked through
the SNI to NIC. The traffic on the cable is ignored.
SNI
83910
NIC
8390
MAU
8392/RTL8005
Ref:
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