Data Sheet

2.Bus Topology
The SD Memory Card system defines two alternative communication protocols:SD and SPI. The host system
can choose either one of modes. The card detects which mode is request by host when the reset command is
received and expects all further communication to be in the same communication mode.
2.1 SD Bus
For more details, refer to Section 3.5.1 of the SDA Physical Layer Specification, Version 5.1
2.2 SPI Bus
For more details, refer to Section 3.5.2 of the SDA Physical Layer Specification, Version 5.1.