GL422/GL423 USB 2.0 +SD/MMC-controller Combo Solution

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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

PHY

Flash

Access

IF

CARD

Controller

USB

Controller

GL422/GL423

Control

Logic

USB

Interface

CARD

Interface

Flash1

Interface

Flash2

Interface

Figure 1.1 - GL422/GL423 Block Diagram