參數(shù)資料
型號(hào)： MPC8308-KIT
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 29/83頁(yè)
文件大?。?/td> 0K
描述： KIT EVALUATION FOR MPC830X
標(biāo)準(zhǔn)包裝： 1
系列： PowerQUICC II™ PRO
類型： MPU
適用于相關(guān)產(chǎn)品： MPC8308
所含物品： 板，線纜，CD，電源
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 3
Freescale Semiconductor
35
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
This table 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 Note
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-to-
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
D+/D- TX output rise/fall
time
TTX-RISE, TTX-FALL
—
0.125
—
UI
2, 5
RMS AC peak common
mode output voltage
VTX-CM-ACp
VPEACPCMTX = RMS(|VTXD+ + VTXD-|/2 -
VTX-CM-DC)
VTX-CM-DC = DC(avg) of |VTX-D+ +
VTX-D-|/2
——
20
mV
2
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MPC8308-SOM 功能描述:開發(fā)板和工具包 - 其他處理器 For MPC8308 Ethernet USB 32bit RoHS:否 制造商:Freescale Semiconductor 產(chǎn)品:Development Systems 工具用于評(píng)估:P3041 核心:e500mc 接口類型:I2C, SPI, USB 工作電源電壓:
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