In order to support this wide range of applications, the MultiMediaCard interface protocol is designed for maximum scalability and configurability. All device and interface configuration data (e.g. maximum frequency, supported modes of operation, memory size, card ID, etc.) will be stored on the MultiMediaCard card. A high performance 7 pin serial interface (SPI) allows for easy integration into any design, regardless of microprocessor utilized.
| MultiMediaCard Interface | SPI Interface | |||||
|---|---|---|---|---|---|---|
| Pin # | Name | Type | Description | Name | Type | Description |
| 1 | RSV | NC | Not Connected or Always '1' | CS | Input | Chip Select (Active low) |
| 2 | CMD | In/Out: OD/PP | Command/Response | DataIn | Input | Host to Card Commands and Data |
| 3 | VSS1 | Power Supply | Supply Voltage Ground | VSS1 | Power Supply | Supply Voltage Ground |
| 4 | VDD | Power Supply | Supply Voltage | VDD | Power Supply | Supply Voltage |
| 5 | CLK | Input | Clock | CLK | Input | Clock |
| 6 | VSS2 | Power Supply | Supply Voltage Ground | VSS2 | Power Supply | Supply Voltage Ground |
| 7 | DAT[0] | In/Out: PP | Data 0 | Data Out | Output | Card to Host Data and Status |
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