commands, which are essential for maintaining SSD health and performance over time. Physical and Electrical Characteristics : 68-pin QFN "Green" package. Regulators
: Compatible with both UASP (USB Attached SCSI Protocol) for high speed and BOT (Bulk Only Transfer) for legacy compatibility. Key Features & Hardware
The Realtek RTL9210B represents a major milestone in high-performance storage connectivity. Released widely in commercial applications around 2021, this dual-protocol bridge controller addresses a critical need in the external storage market: seamless compatibility with both NVMe (PCIe) and SATA M.2 solid-state drives (SSDs).
For enterprise users and professionals handling sensitive data, this integrated security feature transforms a standard external SSD into a biometric-secured storage device, eliminating the need for separate software encryption solutions.
Implements USB Attached SCSI (UAS) protocol for enhanced transfer performance. 2.2 Physical and Electrical rtl9210b datasheet 2021
[ USB 3.1 Gen 2 Host (10 Gbps) ] │ ▼ ┌─────────────────────┐ │ RTL9210B Core │◄─── Type-C CC Logic Built-in └──────────┬──────────┘ │ ┌──────────┴──────────┐ ▼ ▼ [ PCIe Gen 3 x2 ] [ SATA III 6.0 Gbps ] (NVMe SSD) (NGFF SSD) Host-Side Interface
: Supports external SPI Flash for firmware, UART interfaces, and programmable GPIOs for customized LED behavior (e.g., blinking patterns during data access). Package : Compact 68-pin QFN "Green" package. RTL9210 vs. RTL9210B
allows a single enclosure to work with both NVMe and SATA M.2 SSDs. Primary Protocol PCIe NVMe only Primary Protocol PCIe NVMe & SATA SATA Support SATA Support Yes (Gen3, 6Gbps) Max USB Speed Max USB Speed Power Delivery Power Delivery Improved (PD 3.0 on BPD models) Stability and Firmware Enhancements RTL9210B-CG - Realtek
The 2021 datasheet warns that modifying register 0xFC without recomputing CRC16 over the SPI flash will brick the bridge until external programmer re-flash. commands, which are essential for maintaining SSD health
: Full support for UASP (USB Attached SCSI Protocol) for faster transfers and TRIM commands to maintain SSD longevity. Package : 68-pin QFN Green package. Why the 2021 Revision Matters
This section is critical for power supply design. According to the 2021 document:
Are you or troubleshooting a consumer retail drive?
Must be routed with a strict 90-ohm differential impedance. Trace length matching between the positive and negative signals must be within 0.12 mm (5 mils). Key Features & Hardware The Realtek RTL9210B represents
The v1.27.25.072921 release marked a significant turning point, specifically addressing the instability issues that plagued early adopters of the chip. This firmware revision is particularly recommended for users experiencing compatibility problems with Samsung or Western Digital NVMe SSDs.
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| | Detail | Specification / Value | Notes | | :--- | :--- | :--- | :--- | | General | Part Number | RTL9210B-CG | Standard version | | | Package | 68-pin QFN (8mm x 8mm) | | | | Variant | RTL9210BPD-CG | Adds Power Delivery (PD 3.0) support | | USB Host Interface | Standard | USB 3.2 Gen 2 (10 Gbps) | Formerly known as USB 3.1 Gen 2 | | | Protocols | UASP, BOT | For high-speed, efficient data transfer | | SSD (Device) Interface | PCIe (NVMe) | PCIe Gen 3 x2 | Provides up to 16 Gbps bandwidth | | | SATA (AHCI) | SATA Gen 3 (6 Gbps) | Provides up to 6 Gbps bandwidth | | Power Management | Technologies | ASPM L1, L1 Substates, LTR | Advanced power-saving modes | | Memory/Storage | External Flash | Supports up to 32 MB SPI Flash | For firmware and custom configurations | | Encryption | Hardware | AES-256 | On-the-fly hardware encryption for data security | | Additional I/O | Features | GPIO, eFUSE, UART, I2C | Allows for custom features like LED control | | Oscillator | Frequency | 25 MHz | |
The chip boasts auto-switching between USB-to-PCIe and USB-to-SATA modes.
