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| 型号： | MPC8569VTANKGB |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | RISC PROCESSOR, PBGA783 |
| 封装： | 29 X 29 MM, 1 MM PITCH, PLASTIC, BGA-783 |
| 文件页数： | 114/126页 |
| 文件大小： | 2847K |
| 代理商： | MPC8569VTANKGB |
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MPC8569E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 0
PCI Express
Freescale Semiconductor
88
The following table defines the AC specifications for the PCI Express (2.5 Gb/s) differential input at all receivers (RXs). The
parameters are specified at the component pins. The AC timing specifications do not include RefClk jitter.
Table 51. PCI Express (2.5 Gb/s) Differential Receiver (RX) Input AC Specifications
At recommended operating conditions with ScoreVDD = 1.0 V ± 3%. and 1.1 V ± 3%
Parameter
Symbol
Min
Typ
Max
Unit
Comments
Unit interval
UI
399.88
400.00
400.12
ps
Each UI is 400 ps ± 300 ppm. UI does not account for
spread spectrum clock dictated variations. See Note 1.
Minimum
receiver eye
width
TRX-EYE
0.4
—
UI
The maximum interconnect media and transmitter jitter
that can be tolerated by the receiver can be derived as
TRX-MAX-JITTER = 1 – TRX-EYE = 0.6 UI. See Notes 2 and 3.
Maximum time
between the
jitter median
and maximum
deviation from
the median.
TRX-EYE-MEDIA
N-to-MAX-JITTER
—
0.3
UI
Jitter is defined as the measurement variation of the
crossing points (VRX-DIFFp-p = 0 V) in relation to a
recovered TX UI. A recovered TX UI is calculated over
3500 consecutive unit intervals of sample data. Jitter is
measured using all edges of the 250 consecutive UI in the
center of the 3500 UI used for calculating the TX UI.
See Notes 2, 3, and 4.
Notes:
1. No test load is necessarily associated with this value.
2. Specified at the measurement point and measured over any 250 consecutive UIs. The test load in Figure 46 must be used as
the RX device when taking measurements. If the clocks to the RX and TX are not derived from the same reference clock, the
TX UI recovered from 3500 consecutive UI must be used as a reference for the eye diagram.
3. A TRX-EYE = 0.40 UI provides for a total sum of 0.60 UI deterministic and random jitter budget for the transmitter and
interconnect collected any 250 consecutive UIs. The TRX-EYE-MEDIAN-to-MAX-JITTER specification ensures a jitter distribution in
which the median and the maximum deviation from the median is less than half of the total. UI jitter budget collected over any
250 consecutive TX UIs. It must be noted that the median is not the same as the mean. The jitter median describes the point
in time where the number of jitter points on either side is approximately equal as opposed to the averaged time value. If the
clocks to the RX and TX are not derived from the same reference clock, the TX UI recovered from 3500 consecutive UI must
be used as the reference for the eye diagram.
4. It is recommended that the recovered TX UI is calculated using all edges in the 3500 consecutive UI interval with a fit algorithm
using a minimization merit function. Least squares and median deviation fits have worked well with experimental and
simulated data.
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