参数资料
型号: MPC8379VRANG
厂商: Freescale Semiconductor
文件页数: 59/117页
文件大小: 0K
描述: MPU POWERQUICC II PRO 689-PBGA
标准包装: 27
系列: MPC83xx
处理器类型: 32-位 MPC83xx PowerQUICC II Pro
速度: 800MHz
电压: 1.05V
安装类型: 表面贴装
封装/外壳: 689-BBGA 裸露焊盘
供应商设备封装: 689-TEPBGA II(31x31)
包装: 托盘
MPC8379E PowerQUICC II Pro Processor Hardware Specifications, Rev. 8
46
Freescale Semiconductor
11.2.1
Full-Speed Output Path (Write)
This figure 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
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
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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