參數(shù)資料
型號: MPC8379ECVRANGA
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): 55/114頁
文件大?。?/td> 1337K
代理商: MPC8379ECVRANGA
MPC8379E PowerQUICC II Pro Processor Hardware Specifications, Rev. 2
Freescale Semiconductor
45
Enhanced Secure Digital Host Controller (eSDHC)
11.2.1
Full-Speed Output Path (Write)
Figure 27 provides the data and command output timing diagram.
Figure 27. Full Speed Output Path
11.2.1.1
Full-Speed Write Meeting Setup (Maximum Delay)
The following equations show how to calculate the allowed skew range between the SD_CLK and
SD_DAT/CMD signals on the PCB.
No clock delay:
tSFSKHOV + tDATA_DELAY + tISU < tSFSCKL
With clock delay:
tSFSKHOV + tDATA_DELAY + tISU < tSFSCKL + tCLK_DELAY
tDATA_DELAY + tSFSCKL < tSFSCK + tCLK_DELAY tISU tSFSKHOV
This means that data can be delayed versus clock up to 11 ns in ideal case of tSFSCKL =20 ns:
tDATA_DELAY + 20 < 40 + tCLK_DELAY 5 4
tDATA_DELAY < 11 + tCLK_DELAY
11.2.1.2
Full-Speed Write Meeting Hold (Minimum Delay)
The following equations show how to calculate the allowed skew range between the SD_CLK and
SD_DAT/CMD signals on the PCB.
tCLK_DELAY < tSFSCKL + tSFSKHOX + tDATA_DELAY tIH
tCLK_DELAY + tIH tSFSKHOX < tSFSCKL+ tDATA_DELAY
Input at the
MPC8379E Pins
SD CLK at the
MPC8379E Pin
Output Valid Time: tSFSKHOV
Output Hold Time: tSFSKHOX
tIH (5 ns)
tCLK_DELAY
SD CLK at
Driving
Edge
Sampling
Edge
the Card Pin
tISU (5 ns)
tDATA_DELAY
tSFSCKL
tSFSCK (Clock Cycle)
Output from the
MPC8379E Pins
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