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GL3227 is an USB 3.1 GEN1 to SD4.0 Single LUN Memory Card Reader Controller.


GL3227 supports various types of SD memory cards, such as Secure DigitalTM (SD), SDHC, miniSD and microSD (T-Flash), MultiMediaCardTM (MMC), RS-MMC, MMCmicro and MMCmobile. It also supports high density memory cards (Capacity up to 2TB), such as SDXC, ultra high speed memory cards, SD3.0 UHS-I and the latest generation high speed memory cards SD4.0 UHS-II card.


The GL3227 integrates a high speed 8051 microprocessor and a high efficiency hardware engine for the best data transfer performance between USB and various memory card interfaces. It supports ISP (In System Programming) for firmware upgrade from the external SPI Flash via USB port. It integrates 5V to 3.3V and 3.3V to 1.2V regulators and power MOSFETs which can reduce system BOM cost. It also integrates 5V to 1.2V DC-DC as alternative to improve the power efficiency.

  • USB specification compliance
    • Comply with Universal Serial Bus 3.1 Specification (USB 3.1 GEN1)
    • Comply with Universal Serial Bus Specification rev. 2.0 (USB 2.0)
    • Comply with USB Mass Storage Class Specification rev. 1.0
    • Support USB Mass Storage Class Bulk-Only Transport (BOT)
    • Support 1 device address and up to 3 endpoints: Control (0) / Bulk Data Read In (1) / Bulk Data Write Out (2)
    • Support 5 Gbps/SuperSpeed, 480 Mbps/high-speed, and 12 Mbps/full-speed transfer rates
  • Integrated USB building blocks
    • SuperSpeed USB/USB 2.0 transceiver macro (UTM), Serial Interface Engine (SIE), and embedded Power-On Reset (POR)
  • Embedded high speed 8051 micro-controller
  • High efficiency hardware DMA engine improves data transfer performance between USB and flash card interfaces
  • Support Secure DigitalTM v1.0 / v1.1 / v2.0/ SDHC / SDXC (capacity up to 2TB)
  • Support Secure DigitalTM v3.0 UHS-I (Ultra High Speed): SDR12/SDR25/SDR50/DDR50/SDR104
  • Support Secure DigitalTM v4.0 UHS-II: Full Duplex Mode and Half Duplex Mode
  • Support Secure DigitalTM v5.0
  • Support MultiMediaCardTM (MMC)
    • MMC specification v3.x / v4.0 / v4.1 / v4.2 / v4.3 / v4.4
    • x1 / x4 bit data bus
  • Support HUAWEI Nano Memory Card
  • Support ISP (In System Programming) for firmware upgrade from the external SPI Flash via USB port
  • On-Chip power MOSFETs for supplying flash media card power
  • On-chip 5V to 3.3V and 3.3V to 1.2V regulator
  • On-chip 5V to 1.2V DC-DC to improve power efficiency.
  • Support Over-Current protection mechanism
  • Support USB 2.0 LPM (Link Power Management)
  • Support USB 3.1 GEN1 LTM (Latency Tolerance Messaging)
  • Support USB 3.1 GEN1 U1/U2/U3 low power link state
  • Pass the USB-IF Test Procedure for SuperSpeed product (TID: 340970004)
  • Support Latency Tolerance Messaging 
  • Support remote wakeup function
  • Support Intel Power Optimizer
  • Support Windows Connected Standby
  • Support Spread Spectrum Clock for SD to reduce EMI effect
  • Support over clock of UHS-II RCLK for better read/write performance (Optional)
  • Available in QFN48 pin package (6x6mm)

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