RTL8029AS Ver la hoja de datos (PDF) - Unspecified

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RTL8029AS

Realtek PCI Full-Duplex Ethernet Controller with built-in SRAM

Unspecified 

RTL8029AS Preliminary

6.5.5 LED Output States in Power Down Modes

LED Output

LED_BNC

LED_LINK

LED_COL

LED_TX

LED_RX

LED_CRS

Normal Mode / Idle

-

-

High

Low

Low

Low

Sleep Mode

-

High

High

High

High

High

Power Down Mode

Low

High

High

High

High

High

6.6. Loopback Diagnostic Operation

6.6.1. Loopback operation

The RTL8029AS 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.

NIC

Ref: 8390

SNI

83910

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.

NIC

Ref: 8390

SNI

83910

MAU

8392/RTL8005

Mode 3: Loopback through the cable (LB1=1, LB0=1 in TCR)

The packets are transmitted via the MAU onto the network and RTL8029AS receives all

incoming packets (not only the MAU-loopbacked Tx data) in the meantime.

NIC

Ref: 8390

SNI

83910

MAU

8392/RTL8005

CABLE

LS009.0

31

1997.01.16

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