The **M2AS1-5241-R2** is a specific part number typically associated with high-density server storage components, specifically an **M.2 SSD Retimer Card** or an **M.2 to PCIe Adapter** used in enterprise servers (often linked to Inspur or similar server manufacturers). Below is a breakdown of the electronic specifications and functional characteristics of this part. --- ### 1. General Specifications The M2AS1-5241-R2 is designed to facilitate the connection of high-speed M.2 NVMe solid-state drives into a server chassis, ensuring signal integrity over longer traces. | Feature | Specification | | :--- | :--- | | **Form Factor** | Proprietary Mezzanine / Riser Card | | **Interface Type** | PCIe Gen 4.0 x8 (Host) to M.2 (Device) | | **Drive Support** | M.2 NVMe (usually 2280 or 22110 lengths) | | **Drive Slots** | Dual M.2 Slots (Typical) | | **Protocol** | NVMe (Non-Volatile Memory Express) | --- ### 2. Key Electronic Components This board is not just a passive physical bridge; it contains active electronics to manage data and power. #### A. Retimer / Redriver ICs Because PCIe Gen 4 signals degrade quickly over distance, this board uses **Retimer chips**. - **Function:** These chips regenerate the PCIe signals to eliminate jitter and maintain data integrity between the CPU and the SSDs. - **Benefit:** Allows for stable high-speed data transfers (up to 16 GT/s per lane). #### B. Power Management (DC-DC Conversion) Server motherboards provide 12V power, but M.2 SSDs require 3.3V. - **Voltage Regulators:** High-efficiency buck converters step down the voltage. - **Protection:** Includes over-current protection (OCP) and over-voltage protection (OVP) to prevent damage to expensive SSDs. #### C. Clock Buffers The board includes a clock distribution circuit to ensure that the reference clock (RefClk) reaches both M.2 drives simultaneously, ensuring synchronized communication with the PCIe root complex. --- ### 3. Physical Layout & Connectivity * **Edge Connector:** A high-density gold-finger connector that plugs into the server's specialized riser slot. * **M-Key Slots:** Standard M-Key connectors designed for NVMe storage modules. * **LED Indicators:** Onboard LEDs provide visual status for "Power Good" and "Drive Activity." --- ### 4. Application Context The "R2" suffix typically denotes a second revision of the hardware, often improving thermal performance or compatibility with newer PCIe 4.0 specifications compared to the R1 version. It is primarily used for: 1. **Boot Drives:** Providing redundant (RAID 1) boot drives for Operating Systems. 2. **Caching:** Using high-speed NVMe as a cache layer for larger SATA/SAS arrays. ---