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GL9755 is a PCI Express Rev. 2.1 compliant card reader controller which integrates PCI Express PHY, UHS-II PHY, memory card access interface, regulators (3.3V-to-1.8V and 3.3V-to-1.2V) and card power switch.


GL9755 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, SD 3.0 UHS-I and the latest generation high speed memory cards SD 4.0 UHS-II card.


GL9755 supports PCI Express L1 PM sub-states, Runtime D3 (RTD3), Latency Tolerance Reporting (LTR), and Optimized Buffer Flush/Fill (OBFF) for saving power consumption.

  • Compliant with PCI Express Base Specification Rev. 2.1
  • Support 1-Lane 2.5 / 5.0 Gbps PCI Express Bus
  • Compliant with SD Specifications Part 1 Physical Layer Specification Version 4.20
  • Compliant with SD Specifications Part A2 SD Host Controller Standard Specification Version 4.20
  • Supported memory card interfaces:
    • Secure Digital TM (SD), SDXC, SDHC, MultiMediaCard TM (MMC)
    • MMC 4-bit date mode
    • Support SD 4.0 UHS-II FD/HD mode up to 312MB/sec
    • Support SD 3.0 UHS-I SDR-104 (208MHz SD clock), SDR-50 (100MHz SD clock) and DDR 50 (50MHz SD clock)
  • Support SD CPRM function
  • Support PCI Express Clock Request (CLK_REQ#)
  • Support PCI Express ASPM L0s / L1
  • Support PCI Express L1 sub-states (L1.1 and L1.2) and RTD3 (Runtime D3 hot/cold)
  • Support PCI Express LTR (Latency Tolerance Reporting) and OBFF (Optimized Buffer Flush/Fill)
  • Support Modern Standby
  • High efficiency hardware DMA engine to improve data transfer performance
  • On-chip 3.3V to 1.2V regulator for core and analog macros
  • On-chip 3.3V to 1.8V regulator for SD 4.0 card power VDD2 (300 mA)
  • On-chip 3.3V power switch for SD card power (800 mA)
  • Support Over-current protection mechanism. Over-current flag is asserted when ICARD_3V3 over 800mA ; Over-current flag is asserted when ISD_VDD2 over 300mA (Refer to Section 11.3 in Programming Guide)
  • Support Spread Spectrum Clock (SSC) for SD to reduce EMI effect
  • Support SMBus for SD UHS-II Compliance Test (Refer to Section 14.2 in Programming Guide)
  • Available in QFN32 4mmx4mm package

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