參數(shù)資料
型號(hào)： MPC8308VMAGDA
廠商： FREESCALE SEMICONDUCTOR INC
元件分類(lèi)： 微控制器/微處理器
英文描述： RISC MICROCONTROLLER, PBGA473
封裝： 19 X 19 MM, 1.39 MM HEIGHT, 0.80 MM PITCH, LEAD FREE, PLASTIC, MABGA-473
文件頁(yè)數(shù)： 30/90頁(yè)
文件大?。?/td> 1123K
代理商： MPC8308VMAGDA
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 2
36
Freescale Semiconductor
PCI Express
11.3
Clocking Dependencies
The ports on the two ends of a link must transmit data at a rate that is within 600 parts per million (ppm)
of each other at all times. This is specified to allow bit rate clock sources with a ±300 ppm tolerance.
11.4
Physical Layer Specifications
Following is a summary of the specifications for the physical layer of PCI Express on this device. For
further details as well as the specifications of the transport and data link layer please use the PCI Express
Base Specification, Rev. 1.0a.
11.4.1
Differential Transmitter (TX) Output
Table 34 defines the specifications for the differential output at all transmitters (TXs). The parameters are
specified at the component pins.
Table 34. Differential Transmitter (TX) Output Specifications
Parameter
Symbol
Comments
Min
Typical
Max
Units
Notes
Unit interval
UI
Each UPETX is 400 ps ±
300 ppm. UPETX does not
account for Spread
Spectrum Clock dictated
variations.
399.88
400
400.12
ps
1
Differential peak-to-peak
output voltage
VTX-DIFFp-p
VPEDPPTX = 2*|VTX-D+ -
VTX-D-|
0.8
—
1.2
V
2
De-Emphasized
differential output voltage
(ratio)
VTX-DE-RATIO
Ratio of the VPEDPPTX of
the second and following
bits after a transition
divided by the VPEDPPTX
of the first bit after a
transition.
–3.0
–3.5
–4.0
dB
2
Minimum TX eye width
TTX-EYE
The maximum Transmitter
jitter can be derived as
TTX-MAX-JITTER = 1 -
UPEEWTX= 0.3 UI.
0.70
——UI
2, 3
Maximum time between
the jitter median and
maximum deviation from
the median
TTX-EYE-MEDIAN-t
o-
MAX-JITTER
Jitter is defined as the
measurement variation of
the crossing points
(VPEDPPTX = 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.
—
0.15
UI
2, 3
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