参数资料
型号: MPC8379VRANG
厂商: Freescale Semiconductor
文件页数: 64/117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
50
Freescale Semiconductor
This means that data delay should be equal or less than the clock delay in the ideal case where
tSHSCLKL =10 ns:
tDATA_DELAY tCLK_DELAY < 10 6 4
tDATA_DELAY tCLK_DELAY < 0
11.3.1.2
High-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 < tSHSCKL + tSHSKHOX + tDATA_DELAY tIH
Eqn. 13
tCLK_DELAY tDATA_DELAY < tSHSCKL + tSHSKHOX tIH
Eqn. 14
This means that clock can be delayed versus data up to 8 ns (external delay line) in ideal case of
tSHSCLKL =10 ns:
tCLK_DELAY tDATA_DELAY < 10 + 0 2
tCLK_DELAY tDATA_DELAY < 8
11.3.2
High-Speed Input Path (Read)
This figure provides the data and command input timing diagram.
Figure 31. High-Speed Input Path
For the input path, the device eSDHC expects to sample the data 1.5 internal clock cycles after it was
driven by the SD card. Since in this mode the SD card drives the data at the rising edge of the clock, a
sufficient delay to the clock and the data must exist to ensure it will not be sampled at the wrong internal
tCLK_DELAY
Output from the
SD CLK at
the Card Pin
SD Card Pins
tSHSIVKH
Driving
Edge
Sampling
Edge
tOH
tDATA_DELAY
tODLY
tSHSCK (Clock Cycle)
1/2 Cycle
tSHSIXKH
Right Edge
Wrong Edge
(MPC8379E Input Hold)
(MPC8379E Input Setup)
Input at the
MPC8379E Pins
SD CLK at the
MPC8379E Pin
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