6. Cb = total capacitance of the one bus line in pF.
SDA
SCL
tHD; STA
tHD; DAT
tLOW
tSU; DAT
tHIGH
tSU; STA
SR
P
S
tHD; STA
tSP
tSU; STO
tBUF
tf
tr
tf
tr
Figure 23. Timing definition for fast and standard mode devices on the I2C bus
6.8.5 UART switching specifications
6.8.6 SDHC specifications
The following timing specs are defined at the chip I/O pin and must be translated
appropriately to arrive at timing specs/constraints for the physical interface.
Table 43. SDHC switching specifications
Num
Symbol
Description
Min.
Max.
Unit
Card input clock
SD1
fpp
Clock frequency (low speed)
0
400
kHz
fpp
Clock frequency (SD\SDIO full speed\high speed)
0
25\50
MHz
fpp
Clock frequency (MMC full speed\high speed)
0
20\50
MHz
fOD
Clock frequency (identification mode)
0
400
kHz
SD2
tWL
Clock low time
7
—
ns
SD3
tWH
Clock high time
7
—
ns
SD4
tTLH
Clock rise time
—
3
ns
SD5
tTHL
Clock fall time
—
3
ns
SDHC output / card inputs SDHC_CMD, SDHC_DAT (reference to SDHC_CLK)
SD6
tOD
SDHC output delay (output valid)
-5
8.3
ns
SDHC input / card inputs SDHC_CMD, SDHC_DAT (reference to SDHC_CLK)
SD7
tISU
SDHC input setup time
5
—
ns
SD8
tIH
SDHC input hold time
0
—
ns
Peripheral operating requirements and behaviors
K30 Sub-Family Data Sheet Data Sheet, Rev. 7, 02/2013.
Freescale Semiconductor, Inc.
57