Genesys Logic, Inc.
USB 2.0 SD 3.0/MMC/MS
Card Reader Controller
Product Overview
GL822 Product Overview
Copyright © 2012 Genesys Logic, Inc. All rights reserved. No part of the materials shall be reproduced in any
form or by any means without prior written consent of Genesys Logic, Inc.
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Genesys Logic, Inc. owns and retains of its right, title and interest in and to all materials provided herein.
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any other propriety rights. No license is granted hereunder.
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regarding their accuracy, merchantability, fitness for any particular purpose, and non-infringement of intellectual
property. In no event shall Genesys Logic, Inc. be liable for any damages, including, without limitation, any
direct, indirect, consequential, or incidental damages. The materials may contain errors or omissions. Genesys
Logic, Inc. may make changes to the materials or to the products described herein at anytime without notice.
Genesys Logic, Inc.
12F., No. 205, Sec. 3, Beixin Rd., Xindian Dist. 231,
New Taipei City, Taiwan
Tel : (886-2) 8913-1888
Fax : (886-2) 6629-6168
http ://
©2012 Genesys Logic, Inc. - All rights reserved.
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GL822 Product Overview
The GL822 is a USB 2.0 SD 3.0 UHS-I Memory Card Reader single chip. It supports USB 2.0 high-speed
transmission to Secure DigitalTM (SD), SDHC, miniSD, microSD (T-Flash), MultiMediaCardTM (MMC),
RS-MMC, MMCmicro, MMCmobile, Memory Stick (MS), Memory Stick DuoTM (MS Duo), High Speed
Memory StickTM (HS MS), Memory Stick PRO (MS PRO), Memory Stick PROTM Duo (MS PRO Duo),
Memory Stick PRO-HG (MS PRO-HG) and MS PRO Micro on one chip. It also supports next generation
huge density memory cards (up to 2TB), such as SDXC and Memory Stick XC. As a single chip solution for
USB 2.0 flash card reader, the GL822 complies with Universal Serial Bus specification rev. 2.0, USB Storage
Class specification ver.1.0, and SD/MMC card interface specification.
The GL822 integrates a high speed 8051 microprocessor and a high efficiency hardware engine for the best data
transfer performance between USB and flash card interfaces. Its’ pin assignment design fits to card sockets to
provide easier PCB layout. Inside the chip, it integrates 5V to 3.3V and 3.3V to 1.8V regulators and power
MOSFETs and it enables the function of on-chip clock source (OCCS) which means no external 12MHz XTAL
is needed and that effectively reduces the total BOM cost.
©2012 Genesys Logic, Inc. - All rights reserved.
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GL822 Product Overview
USB specification compliance
- Comply with 480Mbps Universal Serial Bus specification rev. 2.0
- Comply with USB Storage Class specification rev. 1.0
Support one device address and up to four endpoints:
Control (0)/ Bulk Read (1)/ Bulk Write (2)/Interrupt (3)
Integrated USB building blocks
- USB 2.0 transceiver macro (UTM), Serial Interface Engine (SIE), Build-in power-on reset (POR)
Embedded 8051 micro-controller
- Embedded mask ROM and internal SRAM
Secure Digital (SD)
- Support SD specification v1.0 / v1.1 / v2.0/ SDHC (Up to 32GB)
- Support SD specification v3.0 UHS-I: SDR25/SDR50/DDR50/SDR104
- Support 1.8V/3.3V switch signal pads
- Support up to 208 MHz clock frequency
- Support SDXC (Up to 2TB)
MultiMediaCard (MMC)
- Support MMC specification v3.x / v4.0 / v4.1 / v4.2.
- x1 / x4 / x8 bit data bus
Memory StickTM / Memory Stick PRO / Memory Stick PRO Duo / Memory Stick Micro /Memory Stick
PRO-HG / Memory Stick XC
- Comply with Memory Stick specification: MS 1.43 / MS PRO 1.05 / MS HG Micro 1.00 / MS
PRO-HG Duo 1.03 with 8-bit data bus / MS XC 1.00
- Support Read/Write quad data access (512Bytex4) for MS PRO-HG to enhance the transmission rate
On chip clock source (OCCS) and no need of 12MHz Crystal Clock input.
On-Chip 5V to 3.3V and 3.3V to 1.8V regulators
Support 5V to 3.3V Band Gap Regulator for stable voltage supply
Provide Over-Current protection mechanism for safety power supply
On-Chip power MOSFETs for supplying flash media card power
Support Power Saving mode/ Selective suspend mode for better power management.
Available in QFN-28(A) and LQFP-48 package.
Support external serial EEPROM interface for the flexibility to load the vendor information and system
options. Only available in LQFP-48 package.
Package available in 28 pin QFN (5x5 mm) , 28 pin SSOP (209 mil) and 48 pin LQFP(7x7 mm)
Table 2.1 - Product Difference Overview
Package Type
Power Source
Power Management
01, 03, …N
Not support
QFN-28 (A)
01, 03, …N
Power Saving Mode/ Selective Suspend Mode
QFN-28 (B)
02, 04, …N+1
Not support
01, 03, …N
Power Saving Mode/ Selective Suspend Mode
©2012 Genesys Logic, Inc. - All rights reserved.
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GL822 Product Overview
Functional Block Diagram
The USB 2.0 Transceiver Macrocell is the analog circuitry that handles the low level USB protocol and signaling,
and shifts the clock domain of the data from the USB 2.0 rate to one that is compatible with the general logic. On
chip clock source and no need of 12MHz Crystal Clock input.
The Serial Interface Engine, which contains the USB PID and address recognition logic, and other sequencing
and state machine logic to handle USB packets and transactions.
Endpoint FIFO includes Control FIFO (FIFO0), Interrupt FIFO (FIFO3), Bulk In/Out FIFO
 Control FIFO
FIFO of control endpoint 0. It is 64-byte FIFO and used for endpoint 0 data transfer.
 Interrupt FIFO
64-byte depth FIFO of endpoint 3 for status interrupt
 Bulk In/Out FIFO It can be in the TX mode or RX mode:
1. It contains ping-pong FIFO (512 bytes each bank) for transmit/receive data continuously.
2. It can be directly accessed by micro-controller
©2012 Genesys Logic, Inc. - All rights reserved.
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GL822 Product Overview
8051 micro-controller inside.
 8051 Core
Compliant with Intel 8051 high speed micro-controller
FW code on ROM
Internal RAM area for MCU access
Media Interface: SD/MMC/MS/MS PRO/MS PRO-HG
It can access by MCU for memory card short data packet.
 5V to 3.3V
 3.3V to 1.8V
Band Gap Regulator for stable voltage supply for USB PHY, PMOS..
When Power source is 3.3V, the 5V to 3.3V regulator will be disabled.
For core logic and internal memory.
On-Chip power MOSFETs provide Over-Current protection mechanism.
©2012 Genesys Logic, Inc. - All rights reserved.
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