GL422/GL423 USB 2.0 +SD/MMC-controller Combo Solution
CHAPTER 1
GENERAL DESCRIPTION
Genesys Logic’s GL422/GL423 controller is an single-chip controllers support both USB2.0 and
MMC4.0/SD1.1 specifications. While USB controller and SD/MMC card controller are integrated as a
combo-function single chip, this chip provides an enhanced combo solution of USB2.0 and SD/MMC card.
GL422/GL423 is designed based on USB2.0 and MMC4.0/SD1.1 specification. Its unique RAM based firmware
strategy provides flexibility for fast compatibility and performance improvement, therefore, give customers
strong support to win in today’s fast-changing market.
GL422/GL423 manages interface protocol, data storage and retrieval, error detection and correction, defect
handling and diagnostic, as well as power management. With a built-in flash management algorithm,
GL422/GL423 is applicable for most types of flash in the market: SAMSUNG, MICRON, ST, TOSHIBA,
HYNIX and RENESAS.
GL422/GL423 is packaged QFN-56 and VFBGA-54. Both die and QFN/VFBGA package are available and
completely meet SD and MMC memory card mechanical thickness requirement. The pin assignment that fits to
card sockets provides easy PCB layout.
GL422/GL423 die has a dual channel flash access interface, which remarkably speed up read/write performance.
QFN-56 packaged GL422/GL423 supports SD1.1 only. VFBGA-54 packaged GL422/GL423 supports both
SD1.1 and MMC4.0.
Figure 1.1 is the block diagram of VFBGA422/GL423.
USB
Interface
USB
PHY
USB
Controller
Flash
Access
IF
Flash1
Interface
Control
Logic
CARD
Controller
CARD
Interface
Flash2
Interface
GL422/GL423
Figure 1.1 - GL422/GL423 Block Diagram
©2000-2006
Genesys Logic Inc. - All rights reserved.
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