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RM0090: Reference manual - STMicroelectronics

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<strong>RM0090</strong> Secure digital input/output interface (SDIO)<br />

Table 136. Speed class code field<br />

PERFORMANCE_MOVE<br />

This 8-bit field indicates Pm (performance move) and the value can be set by 1 [MB/sec]<br />

steps. If the card does not move used RUs (recording units), Pm should be considered as<br />

infinity. Setting the field to FFh means infinity.<br />

AU_SIZE<br />

SPEED_CLASS Value definition<br />

00h Class 0<br />

01h Class 2<br />

02h Class 4<br />

03h Class 6<br />

04h – FFh Reserved<br />

Table 137. Performance move field<br />

PERFORMANCE_MOVE Value definition<br />

00h Not defined<br />

01h 1 [MB/sec]<br />

02h 02h 2 [MB/sec]<br />

--------- ---------<br />

FEh 254 [MB/sec]<br />

FFh Infinity<br />

This 4-bit field indicates the AU size and the value can be selected in the power of 2 base<br />

from 16 KB.<br />

Table 138. AU_SIZE field<br />

AU_SIZE Value definition<br />

00h Not defined<br />

01h 16 KB<br />

02h 32 KB<br />

03h 64 KB<br />

04h 128 KB<br />

05h 256 KB<br />

06h 512 KB<br />

07h 1 MB<br />

08h 2 MB<br />

Doc ID 018909 Rev 3 870/1416

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