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

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1.1 USB Interface

The USB controller, complied with USB2.0 and USB1.1 specification, explains commands from USB host and

transfers data as a USB application.

1.2 CARD Interface

The card controller, complied with SD1.1/MMC4.0 specification, explains commands from SD/MMC host and

transfers data between SD/MMC host and flash.

1.3 Flash Access Interface

The flash access interface communicates with CPU. It also manages two channels of flash, based on flash

commands. Moreover, it implements defect processing, ECC, and address mapping, etc.

1.4 Control Logic

The control logic module switches the command and data between the USB host and SD/MMC host. By this

module, the chip operates in different mode.

1.5 Embedded CPU

Embedded CPU performs arithmetic and logical operations. In addition, it extracts instruction from ROM and

SRAM, decodes and executes them. It also manages control and status signals between flash access interface and

itself.