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Chip-dat/Realtek-dat/RTL8211-dat/RTL8211-dat.md
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+
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+# RTL8211-dat
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+
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+[RTL8211FD(I)-CG](https://www.realtek.com/Product/Index?id=3976&cate_id=786)
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+
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+
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+## General Description
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+
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+The Realtek RTL8211FD-CG/RTL8211FDI-CG is a highly integrated Ethernet transceiver that is compatible with 10Base-T, 100Base-TX, and 1000Base-T IEEE 802.3 standards. It provides all the necessary physical layer functions to transmit and receive Ethernet packets over CAT.5 UTP cable. The RTL8211FDI-CG is manufactured to industrial grade standards.
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+
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+The RTL8211FD(I)-CG uses state-of-the-art DSP technology and an Analog Front End (AFE) to enable high-speed data transmission and reception over UTP cable. Functions such as Crossover Detection & Auto-Correction, polarity correction, adaptive equalization, cross-talk cancellation, echo cancellation, timing recovery, and error correction are implemented in the RTL8211FD(I)-CG to provide robust transmission and reception capabilities at 10Mbps, 100Mbps, or 1000Mbps.
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+
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+Data transfer between MAC and PHY is via the Reduced Gigabit Media Independent Interface (RGMII) for 1000Base-T, 10Base-T, and 100Base-TX. The RTL8211FD(I)-CG supports various RGMII signaling voltages, including 3.3, 2.5, 1.8, and 1.5V.
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+
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+- 1000Base-T
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+- 10Base-T
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+- 100Base-TX
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+
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+The RTL8211FD(I)-CG incorporates a linear Low-Dropout Regulator (LDO) that features high power supply ripple rejection and low output noise. The built-in LDO means a power inductor is not required for the RTL8211FD(I)-CG; only an output capacitor is required between the 1.0V output and the analog ground for phase compensation, which saves cost and PCB real estate.
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+
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+
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+
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+## Pin Assignments
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+
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+![](2025-05-04-18-54-06.png)
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+
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+
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+## Apps
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+
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+![](2025-05-04-18-50-18.png)
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+
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+- [[fiber-optic-dat]] - [[MDI-dat]] - [[RGMII-dat]] - [[RJ45-dat]] - [[PHY-dat]]
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+
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+- [[network-dat]]
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+
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+### Demo Board
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+
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+![](2025-05-04-19-10-29.png)
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+
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+![](2025-05-04-19-10-52.png)
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+
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+### RTL8211 with RK356x
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+
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+![](2025-05-04-19-17-21.png)
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+
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+[source info ](https://blog.csdn.net/CATTLE_L/article/details/144767114)
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+
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+## ref
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+
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+- [[RGMII-dat]]
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\ No newline at end of file
Chip-dat/Realtek-dat/RTL8211-dat/UIRTL8211fs_0001.pdf
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Chip-dat/chip-dat.md
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@@ -16,6 +16,7 @@
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17 17
[[TI-dat]] - [[ti-motor-dat]] - [[ti-audio-dat]] - [[ti-logic-dat]]
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+[[realtek-dat]] - [[RTL8211-dat]]
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20 21
## function
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Tech-dat/Network-dat/MDI-dat/MDI-dat.md
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+
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+# MDI-dat
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+
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+In networking, **MDI** stands for **Medium Dependent Interface**. It refers to the physical and electrical interface on a network device (like a computer's network interface card (NIC) or a router port) that connects to the network transmission medium, typically a twisted-pair Ethernet cable (like Cat5e or Cat6).
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+
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+Key points about MDI:
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+
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+1. **Pinout:** An MDI port uses a specific pinout where pins 1 and 2 are typically used for transmitting (TX) data, and pins 3 and 6 are used for receiving (RX) data (for 10/100 Mbps Ethernet).
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+2. **Connection:** End devices like computers and routers usually have MDI ports.
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+3. **MDI vs. MDI-X:** Network infrastructure devices like hubs and switches traditionally used **MDI-X** (MDI Crossover) ports. MDI-X ports swap the transmit and receive pairs internally (pins 1 & 2 are RX, pins 3 & 6 are TX). This allows a standard "straight-through" Ethernet cable to connect an MDI device (computer) to an MDI-X device (switch).
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+4. **Cabling:** Connecting two MDI ports (e.g., computer to computer directly) or two MDI-X ports (switch to switch) traditionally required a "crossover" cable, which swaps the TX and RX pairs within the cable itself.
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+5. **Auto MDI-X:** Modern network interfaces often feature **Auto MDI-X**. This technology automatically detects the type of port (MDI or MDI-X) on the other end of the cable and configures its own port accordingly. This eliminates the need for specific straight-through or crossover cables, as the interface handles the necessary pin swapping electronically. Most modern devices support Auto MDI-X.
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+
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+
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+## ref
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+
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+- [[network-dat]]
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+
Tech-dat/Network-dat/fiber-optic-dat/fiber-optic-dat.md
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@@ -16,6 +16,8 @@ apps and solutions
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- [[fiber-optic-app-dat]] - [[fiber-optic-solutions-dat]]
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+Signal == [[SerDes-dat]]
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+
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## note
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