Specifications

Physical Layer Simplified Specification Version 4.10

• Class 2 is more than or equal to 2 MB/sec performance (Default Speed Mode)

• Class 4 is more than or equal to 4 MB/sec performance (Default Speed Mode)

• Class 6 is more than or equal to 6 MB/sec performance (Default Speed Mode)

• Class 10 is more than or equal to 10 MB/sec performance (High Speed Mode)

High and Extended Capacity SD Memory Cards shall support Speed Class Specification and have

performance more than or equal to Class 2.

Note that the unit of performance [MB/sec] indicates 1000x1000 [Byte/sec] while the unit of data size

[MB] indicates 1024x1024 [Byte]. This is because the maximum SD Bus speed is specified by the

maximum SD clock frequency (25 [MB/sec] = 25000000 [Byte/sec] at 50 MHz) and data size is based

on memory boundary (power of 2).

3.5 Bus Topology

This section is a blank in the Simplified Specification

Figure 3-1: A Blank in the Simplified Specification

Figure 3-2: A Blank in the Simplified Specification

Figure 3-3 : A Blank in the Simplified Specification