mpc8379e Freescale Semiconductor, Inc, mpc8379e Datasheet - Page 50

• Manufacturer Part Number: mpc8379e
• Description: Powerquicc Ii Pro Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

Enhanced Secure Digital Host Controller (eSDHC)
11.3.1
Figure 30
11.3.1.1
The following equations show how to calculate the allowed skew range between the SD_CLK and
SD_DAT/CMD signals on the PCB.
Zero clock delay:
With clock delay:
This means that data delay should be equal or less than the clock delay in the ideal case where
t
50
SHSCLKL
t
t
DATA_DELAY
DATA_DELAY
= 10 ns:
provides the data and command output timing diagram.
High-Speed Output Path (Write)
MPC8379E Pins
Output from the
High-Speed Write Meeting Setup (Maximum Delay)
MPC8379E Pin
SD CLK at the
SD Card Pins
the Card Pin
Input at the
SD CLK at
MPC8379E PowerQUICC II Pro Processor Hardware Specifications, Rev. 3
–
–
t
t
t
t
CLK_DELAY
CLK_DELAY
SHSKHOV
Output Valid Time: t
Output Hold Time: t
DATA_DELAY
t
SHSKHOV
+ t
DATA_DELAY
Figure 30. High Speed Output Path
–
< 10
< 0
t
CLK_DELAY
+ t
t
SHSCK
SHSKHOV
SHSKHOX
–
Driving
DATA_DELAY
6
Edge
t
DATA_DELAY
–
4
(Clock Cycle)
+ t
< t
ISU
SHSCKL
< t
+ t
SHSCKL
ISU
–
t
t
< t
ISU
CLK_DELAY
t
ISU
SHSCKL
t
(6 ns)
+ t
SHSCKL
–
CLK_DELAY
t
SHSKHOV
Sampling
Edge
t
IH
(2 ns)
Freescale Semiconductor
Eqn. 10
Eqn. 11
Eqn. 12