tCLK_DELAY
參數(shù)資料
型號: MPC8379CVRAGD
廠商: Freescale Semiconductor
文件頁數(shù): 60/117頁
文件大?。?/td> 0K
描述: MPU POWERQUICC II PRO 689-PBGA
標準包裝: 27
系列: MPC83xx
處理器類型: 32-位 MPC83xx PowerQUICC II Pro
速度: 400MHz
電壓: 1V
安裝類型: 表面貼裝
封裝/外殼: 689-BBGA 裸露焊盤
供應商設備封裝: 689-TEPBGA II(31x31)
包裝: 托盤
MPC8379E PowerQUICC II Pro Processor Hardware Specifications, Rev. 8
Freescale Semiconductor
47
tCLK_DELAY + tIH tSFSKHOX < tSFSCKL+ tDATA_DELAY
Eqn. 5
This means that clock can be delayed versus data up to 15 ns (external delay line) in ideal case of
tSFSCLKL =20 ns:
tCLK_DELAY + 5 0 < 20 + tDATA_DELAY
tCLK_DELAY < 15 + tDATA_DELAY
11.2.1.3
Full-Speed Write Combined Formula
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.
tCLK_DELAY + tIH tSFSKHOX < tSFSCKL + tDATA_DELAY < tSFSCK+ tCLK_DELAY tISU tSFSKHOV
Eqn. 6
11.2.2
Full-Speed Input Path (Read)
This figure provides the data and command input timing diagram.
Figure 28. Full Speed Input Path
11.2.2.1
Full-Speed Read Meeting Setup (Maximum Delay)
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.
tCLK_DELAY + tDATA_DELAY + tODLY + tSFSIVKH < tSFSCK
Eqn. 7
tCLK_DELAY + tDATA_DELAY < tSFSCK tODLY tSFSIVKH tINT_CLK_DLY
Eqn. 8
tCLK_DELAY
Output from the
SD CLK at
the card pin
SD card pins
tSFSIVKH
tSFSIXKH
Driving
edge
Sampling
edge
tOH
tDATA_DELAY
tODLY
tSFSCK (clock cycle)
(MPC8379E input hold)
SD CLK at the
MPC8379E pin
Input at the
MPC8379E pins
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