參數(shù)資料
型號(hào)： MPC8379ECVRALGA
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 400 MHz, MICROPROCESSOR, PBGA689
封裝： 31 X 31 MM, 2.46 MM HEIGHT, 1 MM PITCH, LEAD FREE, PLASTIC, BGA-689
文件頁數(shù)： 53/114頁
文件大小： 1337K
代理商： MPC8379ECVRALGA
MPC8379E PowerQUICC II Pro Processor Hardware Specifications, Rev. 2
Freescale Semiconductor
43
Enhanced Secure Digital Host Controller (eSDHC)
Due to the special implementation of the eSDHC, there are constraints regarding the clock and data signals
propagation delay on the user board. The constraints are for minimum and maximum delays, as well as
skew between the CLK and DAT/CMD signals.
In full speed mode, there is no need to add special delay on the data or clock signals. The user should make
sure to meet the timing requirements as described further within this document.
If the system is designed to support both high-speed and full-speed cards, the high-speed constraints
should be fulfilled. If the systems is designed to operate up to 25 MHz only, full-speed mode is
recommended.
11.1
eSDHC DC Electrical Characteristics
Table 40 provides the DC electrical characteristics for the eSDHC (SD/MMC) interface of the device.
11.2
eSDHC AC Timing Specifications (Full-Speed Mode)
This section describes the AC electrical specifications for the eSDHC (SD/MMC) interface of the device.
Table 41 provides the eSDHC AC timing specifications for full-speed mode as defined in Figure 27 and
Table 40. eSDHC interface DC Electrical Characteristics
Parameter
Symbol
Condition
Min
Max
Unit
Input high voltage
VIH
—
0.625
× OVDD
OVDD +0.3
V
Input low voltage
VIL
—
–0.3
0.25
× OVDD
V
Input current
IIN
——
±30
μA
Output high voltage
VOH
IOH = –100 uA,
at OVDD(min)
0.75
× OVDD
—V
Output low voltage
VOL
IOL = +100 uA,
at OVDD(min)
—
0.125
× OVDD
V
Table 41. eSDHC AC Timing Specifications for Full-Speed Mode
At recommended operating conditions OVDD = 3.3 V ± 165 mV.
Parameter
Symbol 1
Min
Max
Unit
Notes
SD_CLK clock frequency—full speed mode
fSFSCK
025
MHz
—
SD_CLK clock cycle
tSFSCK
40
—
ns
—
SD_CLK clock frequency—identification mode
fSIDCK
0400
KHz
—
SD_CLK clock low time
tSFSCKL
15
—
ns
SD_CLK clock high time
tSFSCKH
15
—
ns
SD_CLK clock rise and fall times
tSFSCKR/
tSFSCKF
—5
ns
Input setup times: SD_CMD, SD_DATx, SD_CD to
SD_CLK
tSFSIVKH
5—
ns
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