GL424 SD/MMC Flash Card Controller

©2000-2007 Genesys Logic Inc. - All rights reserved.

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Flash Access

IF

CARD

Controller

GL424

Host Interface

HOST

Interface

Flash1

Interface

Flash2

Interface

Figure 1. 1 - GL424 Block Diagram

1.1 CARD Interface

The card controller, complied with SD/MMC specification, explains commands from SD/MMC host and

transfers data between SD/MMC host and flash.

1.2 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.

1.3 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.