MPC8309CVMADFC datasheet(40/81 Pages) NXP

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MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 3

Freescale Semiconductor

eSDHC

The following figure provides the eSDHC clock input timing diagram.

Figure 30. eSDHC Clock Input Timing Diagram

The following figure provides the data and command input/output timing diagram.

Figure 31. eSDHC Data and Command Input/Output Timing Diagram Referenced to Clock

Input hold times: SD_CMD, SD_DATx, SD_CD to

SD_CLK

tSHSIXKH

2.5

—

3, 4

Output delay time: SD_CLK to SD_CMD, SD_DATx valid

tSHSKHOV

–3

Notes:

1. The symbols used for timing specifications herein follow the pattern of t(first three letters of functional block)(signal)(state)

(reference)(state) for inputs and t(first three letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tFHSKHOV

symbolizes eSDHC high-speed mode device timing (SHS) clock reference (K) going to the high (H) state, with respect to the

output (O) reaching the invalid state (X) or output hold time. Note that in general, the clock reference symbol is based on five

letters representing the clock of a particular functional. For rise and fall times, the latter convention is used with the

appropriate letter: R (rise) or F (fall).

2. In full-speed mode, the clock frequency value can be 0–25 MHz for an SD/SDIO card and 0–20 MHz for an MMC card. In

high-speed mode, the clock frequency value can be 0–33.25 MHz for an SD/SDIO card and 0–52 MHz for an MMC card.

3. To satisfy hold timing, the delay difference between clock input and cmd/data input must not exceed 2 ns.

4. CCARD  10 pF, (1 card), and CL = CBUS + CHOST +CCARD 40 pF

Table 40. eSDHC AC Timing Specifications (continued)

At recommended operating conditions with OVDD =3.3 V

Parameter

Symbol1

Min

Max

Unit

Notes

eSDHC

tSHSCKR

External Clock

tSHSCK

tSHSCKF

VM = Midpoint Voltage (OVDD/2)

operational mode

tSHSCKL

tSHSCKH

VM = Midpoint Voltage (OVDD/2)

SD_CK

External Clock

SD_DAT/CMD

Inputs

SD_DAT/CMD

Outputs

tSHSIVKH

tSHSIXKH

tSHSKHOV

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