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eSDHC
Table 40. eSDHC AC timing specifications (continued)
At recommended operating conditions with OV DD = 3.3 V
Parameter
Input hold times: SD_CMD, SD_DATx, SD_CD to
Symbol 1
t SHSIXKH
Min
2.5
Max
—
Unit
ns
Notes
3, 4
SD_CLK
Output delay time: SD_CLK to SD_CMD, SD_DATx valid
t SHSKHOV
–3
3
ns
4
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, t FHSKHOV
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. C CARD ≤ 10 pF, (1 card), and C L = C BUS + C HOST + C CARD ≤ 40 pF
The following figure provides the eSDHC clock input timing diagram.
eSDHC
External Clock
operational mode
VM
VM
VM
t SHSCKL
t SHSCKH
t SHSCK
VM = Midpoint Voltage (OV DD /2)
t SHSCKR
t SHSCKF
Figure 30. eSDHC clock input timing diagram
The following figure provides the data and command input/output timing diagram.
SD_CK
External Clock
VM
VM
t SHSIVK H
VM
t SHSIXKH
VM
SD_DAT/CMD
Inputs
SD_DAT/CMD
Outputs
t SHSKHOV
VM = Midpoint Voltage (OV DD /2)
Figure 31. eSDHC data and command input/output timing diagram referenced to clock
MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 3
40
Freescale Semiconductor
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