IMX28CEC datasheet(54/70 Pages) FREESCALE

54 / 70 page

i.MX28 Applications Processors Data Sheet for Consumer Products, Rev. 1

Freescale Semiconductor

3.5.14

Synchronous Serial Port (SSP) AC Timing

This section describes the electrical information of the SSP, which includes SD/MMC4.3 (Single Data

Rate) timing, MMC4.4 (Dual Date Rate) timing, MS (Memory Stick) timing, and SPI timing.

3.5.14.1

SD/MMC4.3 (Single Data Rate) AC Timing

Figure 36 depicts the timing of SD/MMC4.3, and Table 58 lists the SD/MMC4.3 timing characteristics.

Figure 36. SD/MMC4.3 Timing

Table 58. SD/MMC4.3 Interface Timing Specification

Parameter

Symbols

Min

Max

Unit

Card Input Clock

SD1

Clock Frequency (Low Speed)

fPP

400

kHz

Clock Frequency (SD/SDIO Full Speed/High

Speed)

fPP

025/50

MHz

Clock Frequency (MMC Full Speed/High Speed)

fPP

020/52

MHz

Clock Frequency (Identification Mode)

fOD

100

400

kHz

SD2

Clock Low Time

tWL

7—

SD3

Clock High Time

tWH

7—

SD4

Clock Rise Time

tTLH

—3

SD5

Clock Fall Time

tTHL

—3

SSP Output / Card Inputs CMD, DAT (Reference to CLK)

SD6

SSP Output Delay

tOD

-5

SSP Input / Card Outputs CMD, DAT (Reference to CLK)

SD1

SD3

SD5

SD4

SD7

CMD

output from SSP to card

DAT1

......

DAT7

DAT0

CMD

input from card to SSP

DAT1

......

DAT7

DAT0

SCK

SD2

SD8

SD6

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