MPC8379E-RDB Freescale Semiconductor, MPC8379E-RDB Datasheet - Page 47
![no-image](/images/manufacturer_photos/0/2/262/freescale_semiconductor_sml.jpg)
MPC8379E-RDB
Manufacturer Part Number
MPC8379E-RDB
Description
BOARD REFERENCE FOR MPC837
Manufacturer
Freescale Semiconductor
Series
PowerQUICC II™ PROr
Type
MPUr
Datasheet
1.MPC8379VRAGD.pdf
(116 pages)
Specifications of MPC8379E-RDB
Contents
Board
For Use With/related Products
MPC8379
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
- Current page: 47 of 116
- Download datasheet (2Mb)
This means that clock can be delayed versus data up to 15 ns (external delay line) in ideal case of
t
11.2.1.3
The following equation is the combined formula to calculate the allowed skew range between the
SD_CLK and SD_DAT/CMD signals on the PCB.
11.2.2
Figure 28
11.2.2.1
The following equations show how to calculate the allowed combined propagation delay range of the
SD_CLK and SD_DAT/CMD signals on the PCB.
Freescale Semiconductor
SFSCLKL
t
CLK_DELAY
t
t
CLK_DELAY
CLK_DELAY
= 20 ns:
provides the data and command input timing diagram.
Full-Speed Input Path (Read)
Full-Speed Write Combined Formula
Full-Speed Read Meeting Setup (Maximum Delay)
MPC8379E Pins
Output from the
MPC8379E Pin
SD CLK at the
+ t
t
SD Card Pins
CLK_DELAY
the Card Pin
Input at the
IH
MPC8379E PowerQUICC II Pro Processor Hardware Specifications, Rev. 4
SD CLK at
+ 5
< 15 + t
–
t
SFSKHOX
t
–
CLK_DELAY
t
CLK_DELAY
0 < 20 + t
DATA_DELAY
+ t
(MPC8379E Input Hold)
DATA_DELAY
< t
SFSCKL
+ t
DATA_DELAY
+ t
Figure 28. Full Speed Input Path
DATA_DELAY
IH
–
< t
t
+ t
SFSKHOX
SFSCK
DATA_DELAY
+ t
–
ODLY
< t
t
Driving
ODLY
SFSCKL
Edge
t
ODLY
< t
t
+ t
OH
t
t
SFSIXKH
–
SFSCK
SFSCK
SFSIVKH
t
SFSIVKH
+ t
t
CLK_DELAY
DATA_DELAY
(Clock Cycle)
+ t
Enhanced Secure Digital Host Controller (eSDHC)
CLK_DELAY
< t
–
t
SFSIVKH
t
SFSCK
DATA_DELAY
t
INT_CLK_DLY
–
t
ISU
–
Sampling
Edge
t
SFSKHOV
Eqn. 5
Eqn. 6
Eqn. 7
Eqn. 8
47
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