Cypress FM4 Series - Overview of SD Card Interface

CHAPTER 15: SD Card Interface
842 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
1. Overview of SD Card Interface
This section provides an overview of the SD card interface.
SD Card Specifications
An SD card compliant with the following specifications can be used with the SD card interface.
 Part 1 Physical Layer Specification Version 3.01
 Part E1 SDIO Specification Version 3.00
 Part A2 SD Host Controller Simplified Specification Version 3.00
Note:
− The SD card interface supports only two Bus Speed modes: Default Speed mode and High
Speed mode.
Features
 SD bus (SPI bus not supported)
 1-bit data bus, 4-bit data bus
 Double buffer for transfer (buffer size: 2 KB)
 Data write protect detection function
 Card detection function
 Multiple read/write transfer
 Transfer data length: 1 byte to 2048 bytes
 Read Wait Option function
 Suspend/Resume function
 Wakeup function
 Shared bus function
 Default Speed mode and High Speed mode (other Bus Speed modes not supported)
 Auto CMD23 supported
 SDMA supported
 ADMA1 supported
 MMC 4.41 supported (sequential commands not supported)
 MMC boot operation supported