Datasheet

MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 3
Freescale Semiconductor 45
Enhanced Secure Digital Host Controller (eSDHC)
13.2 eSDHC AC Timing Specifications (Full Speed Mode)
This section describes the AC electrical specifications for the eSDHC (SD/MMC) interface of the device.
This table provides the eSDHC AC timing specifications for full speed mode as defined in Figure 35 and
Figure 36.
Output low voltage V
OL
I
OL
= 3.2 mA — 0.4 V
Input high voltage V
IH
—2.1NV
DD
+0.3 V
Input low voltage V
IL
—–0.30.8V
Table 39. eSDHC AC Timing Specifications for Full Speed Mode
At recommended operating conditions NV
DD
= 3.3 V ± 300 mV.
Parameter Symbol
1
Min Max Unit Notes
SD_CLK clock frequency—full speed mode f
SFSCK
025MHz—
SD_CLK clock cycle t
SFSCK
40 — ns —
SD_CLK clock frequency—identification mode f
SIDCK
0400kHz—
SD_CLK clock low time t
SFSCKL
15 — ns 2
SD_CLK clock high time t
SFSCKH
15 — ns 2
SD_CLK clock rise and fall times t
SFSCKR
/
t
SFSCKF
—5ns2
Input setup times: SD_CMD, SD_DATx to SD_CLK t
SFSIVKH
3—ns2
Input hold times: SD_CMD, SD_DATx to SD_CLK t
SFSIXKH
2—ns2
Output valid: SD_CLK to SD_CMD, SD_DATx valid t
SFSKHOV
—3ns2
Output hold: SD_CLK to SD_CMD, SD_DATx valid t
SFSKHOX
–3 — — —
SD card input setup t
ISU
5—ns3
SD card input hold t
IH
5—ns3
SD card output valid t
ODLY
—14ns3
SD card output hold t
OH
0—ns3
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
SFSIXKH
symbolizes eSDHC
full mode speed device timing (SFS) input (I) to go invalid (X) with respect to the clock reference (K) going to high (H). Also
t
SFSKHOV
symbolizes eSDHC full speed timing (SFS) for the clock reference (K) to go high (H), with respect to the output (O)
going valid (V) or data output valid time. Note that, in general, the clock reference symbol representation 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
Measured at capacitive load of 40 pF.
3
For reference only, according to the SD card specifications.
4
Average, for reference only.
Table 38. eSDHC interface DC Electrical Characteristics (continued)
Characteristic Symbol Condition Min Max Unit