Fully compatible with MMC system specification Fully compatible with SD Memory Card specification Standard MMC Mode Interface support. Standard SPI(Serial Programming Interface) Interface MMC for MMC(MultiMediaCard) Card. Programmable Clock Rate (62.5KHz ~ 24MHz). Microprocessor I/O transfer mode (High flexibility) or Aut mode (High speed) Support. Auto Command/Response CRC generation/check. Auto Data CRC generation/check. 2 Clock Lines support for twin-card operation.