参数资料
型号: MPC8540VTAQFC
厂商: Freescale Semiconductor
文件页数: 66/104页
文件大小: 0K
描述: MPU POWERQUICC III 783FCPBGA
标准包装: 36
系列: MPC85xx
处理器类型: 32-位 MPC85xx PowerQUICC III
速度: 1.0GHz
电压: 1.3V
安装类型: 表面贴装
封装/外壳: 784-BBGA,FCBGA
供应商设备封装: 783-FCPBGA(29x29)
包装: 托盘
MPC8540 Integrated Processor Hardware Specifications, Rev. 4.1
64
Freescale Semiconductor
RapidIO
enough that increasing the length of the sequence does not cause the resulting eye pattern to change from
one that complies with the RapidIO receive mask to one that does not comply with the mask. The data
carried by any given data signal in the interface may not be correlated with the data carried by any other
data signal in the interface. The zero-crossings of the clock associated with a data signal shall be used as
the timing reference for aligning the multiple recordings of the data signal when the recordings are
overlaid.
While the method used to make the recordings and overlay them to form the eye pattern is not specified,
the method used shall be demonstrably equivalent to the following method. The signal under test is
repeatedly recorded with a digital oscilloscope in infinite persistence mode. Each recording is triggered by
a zero-crossing of the clock associated with the data signal under test. Roughly half of the recordings are
triggered by positive-going clock zero-crossings and roughly half are triggered by negative-going clock
zero-crossings. Each recording is at least 1.9 UI in length (to ensure that at least one complete eye is
formed) and begins 0.5 UI before the trigger point (0.5 UI before the associated clock zero-crossing).
Depending on the length of the individual recordings used to generate the eye pattern, one or more
complete eyes will be formed. Regardless of the number of eyes, the eye whose center is immediately to
the right of the trigger point is the eye used for compliance testing.
An example of an eye pattern generated using the above method with recordings 3 UI in length is shown
in Figure 41. In this example, there is no skew between the signal under test and the associated clock used
to trigger the recordings. If skew was present, the eye pattern would be shifted to the left or right relative
to the oscilloscope trigger point.
Figure 41. Example Receiver Input Eye Pattern
0
+
V
ID
0.5 UI
1.0 UI
Oscilloscope
(Recording)
Trigger Point
Eye Pattern
Eye Used for
Compliance
Testing
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