参数资料
型号: MPC8378E-MDS-PB
厂商: Freescale Semiconductor
文件页数: 77/128页
文件大小: 0K
描述: BOARD PROCESSOR FOR MDS S
标准包装: 1
类型: MPU
适用于相关产品: MPC8378
所含物品:
MPC8378E PowerQUICC II Pro Processor Hardware Specifications, Rev. 8
52
Freescale Semiconductor
11.2.1
Full-Speed Output Path (Write)
This figure provides the data and command output timing diagram.
Figure 31. 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
Eqn. 1
With clock delay:
tSFSKHOV + tDATA_DELAY + tISU < tSFSCKL + tCLK_DELAY
Eqn. 2
tDATA_DELAY + tSFSCKL < tSFSCK + tCLK_DELAY tISU tSFSKHOV
Eqn. 3
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
Eqn. 4
Input at the
MPC8378E pins
SD CLK at the
MPC8378E 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
MPC8378E Pins
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