ZHCSIS3D September 2018 – June 2025 DP83869HM
PRODUCTION DATA
- 1
- 1 特性
- 2 應用
- 3 說明
- 4 Device Comparison
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 WoL (Wake-on-LAN) Packet Detection
- 7.3.2 Start of Frame Detect for IEEE 1588 Time Stamp
- 7.3.3 Clock Output
- 7.3.4 Loopback Mode
- 7.3.5 BIST Configuration
- 7.3.6 Interrupt
- 7.3.7 Power-Saving Modes
- 7.3.8 Mirror Mode
- 7.3.9 Speed Optimization
- 7.3.10 Cable Diagnostics
- 7.3.11 Fast Link Drop
- 7.3.12 Jumbo Frames
- 7.4
Device Functional Modes
- 7.4.1 Copper Ethernet
- 7.4.2 Fiber Ethernet
- 7.4.3 Serial GMII (SGMII)
- 7.4.4 Reduced GMII (RGMII)
- 7.4.5 Media Independent Interface (MII)
- 7.4.6 Bridge Modes
- 7.4.7 Media Convertor Mode
- 7.4.8 Register Configuration for Operational Modes
- 7.4.9 Serial Management Interface
- 7.4.10
Auto-Negotiation
- 7.4.10.1 Speed and Duplex Selection - Priority Resolution
- 7.4.10.2 Leader and Follower Resolution
- 7.4.10.3 Pause and Asymmetrical Pause Resolution
- 7.4.10.4 Next Page Support
- 7.4.10.5 Parallel Detection
- 7.4.10.6 Restart Auto-Negotiation
- 7.4.10.7 Enabling Auto-Negotiation Through Software
- 7.4.10.8 Auto-Negotiation Complete Time
- 7.4.10.9 Auto-MDIX Resolution
- 7.5
Programming
- 7.5.1
Strap Configuration
- 7.5.1.1 Straps for PHY Address
- 7.5.1.2 Strap for DP83869HM Functional Mode Selection
- 7.5.1.3 LED Default Configuration Based on Device Mode
- 7.5.1.4 Straps for RGMII/SGMII to Copper
- 7.5.1.5 Straps for RGMII to 1000Base-X
- 7.5.1.6 Straps for RGMII to 100Base-FX
- 7.5.1.7 Straps for Bridge Mode (SGMII-RGMII)
- 7.5.1.8 Straps for 100M Media Convertor
- 7.5.1.9 Straps for 1000M Media Convertor
- 7.5.2 LED Configuration
- 7.5.3 Reset Operation
- 7.5.1
Strap Configuration
- 7.6 Register Maps
-
8 Application and Implementation
- 8.1 Application Information
- 8.2 Typical Applications
- 8.3 Power Supply Recommendations
- 8.4 Layout
- 9 Device and Documentation Support
- 10Revision History
- 11Mechanical, Packaging, and Orderable Information
7.4.7 Media Convertor Mode
In media convertor mode, DP83869HM translates data between copper and fiber interface for 1000M and 100M speeds. Media convertor mode can be activated through the straps. The DP83869HM supports Unmanaged Media Convertor mode.
Figure 7-11 Media Convertor ModeIn Unmanaged mode, Media Convertor can still be activated via straps but register configuration option are also used for enhanced features like changing LED configuration, Capabilities programming broadcasted in Auto-Neg etc can need configuration and are supported through register programming. Register access to the PHY is retained. This provides additional flexibility to use other features supported by the PHY.
Copper interface supports auto-negotiation, but the user has to make sure that the speed negotiated on the copper side matches the speed fixed on the fiber side. In cases of speed mismatch between copper and fiber, interface data transmission can not be successful.
The DP83869HM also supports Link Loss Pass Through in 100M and 1000M mode. In a network containing two media convertors where the link is dropped on one end of the system, a link loss indication is passed through all the way to the far end. The Link Loss Pass-Through is enabled or disabled through straps. An example is shown in Figure 7-12.
- A fault occurs on copper link at position 1 at Near End Link Partner.
- Media Converter disables Fiber TX link at position 2.
- The Media Converter in the system loses link at position 3.
- The second Media Converter disables copper link and the far end link partner loses the copper link.
Figure 7-12 Link Loss Pass-Through