SPEAR320S-2 datasheet(96/113 Pages) STMICROELECTRONICS

部件名	SPEAR320S-2

功能描述	Embedded MPU with ARM926 core for industrial and consumer applications

PDF	113 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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96 / 113 page

Timing requirements

SPEAr320S

96/113

Doc ID 022508 Rev 2

5.14

SD timing characteristics

Figure 29.

SD timing waveform

Note:

In full-speed mode, the frequency is 24 MHZ (41.6 ns). The data is launched at the falling

edge of the 24 MHZ clock and captured on the clock’s rising edge (the effective available

time is always 20.8 ns)

Table 71.

SD timing requirements (high-speed mode, 48 MHz)

Symbol

Description

Min

Max

Unit

tCK

SD_CLK clock period

20.8

–

SD_CLK to SD output delay

-1.60

Setup time requirement for SD inputs

7.35

Hold time requirement for SD inputs

0.19

Table 72.

SD timing requirements (full-speed mode, 24 MHz)

Symbol

Description

Min

Max

Unit

tCK

SD_CLK clock period

41.6

–

tck-half

SD_CLK half period

20.8

SD_CLK to SD output delay

-0.40

Setup time requirement for SD inputs

7.35

Hold time requirement for SD inputs

0.19

tCK

SD_CLK

SD_DAT#

SD_WP

SD_CMD

SD_LED

SD_CD

SD_DAT#

(input)

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