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