Alinx KINTEX-7FPGA User Manual page 34

KINTEX-7 FPGA Development Board AX7325B User Manual
completed in 1999 by the Japanese Panasonic-led concept, and the
participants Toshiba and SanDisk of the United States conducted
substantial research and development. In 2000, these companies
launched the SD Association (Secure Digital Association), which has
a strong lineup and attracted a large number of vendors. These
include IBM, Microsoft, Motorola, NEC, Samsung, and others.
Driven by these leading manufacturers, SD cards have become the
most widely used memory card in consumer digital devices.
The AX7325B development board includes a Micro SD card
interface to provide users with access to SD card memory for storing
pictures, music or other user data files.
The SDIO signal is connected to the IO signal of the FPGA
BANK12, because the VCCIO of the BANK is VADJ, the default is
+2.5V. However, the SD card has a data level of 3.3 and needs to be
connected via the TXS02612 level shifter. The schematic diagram of
the FPGA and SD card connector is shown in Figure 12-1.
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Figure 12-1: SD Card Slot Schematic
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