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参数资料
型号： MPC8572CPXAUNB
厂商： FREESCALE SEMICONDUCTOR INC
元件分类： 微控制器/微处理器
英文描述： 32-BIT, 1333 MHz, MICROPROCESSOR, PBGA1023
封装： 33 X 33 MM, PLASTIC, FCBGA-1023
文件页数： 125/138页
文件大小： 1502K
代理商： MPC8572CPXAUNB
MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 2
Freescale Semiconductor
87
PCI Express
16.4.3
Differential Receiver (RX) Input Specifications
Table 60 defines the specifications for the differential input at all receivers (RXs). The parameters are
specified at the component pins.
Table 60. Differential Receiver (RX) Input Specifications
Symbol
Parameter
Min
Nominal
Max
Units
Comments
UI
Unit Interval
399.88
400
400.12
ps
Each UI is 400 ps ± 300 ppm. UI does not
account for Spread Spectrum Clock
dictated variations. See Note 1.
VRX-DIFFp-p
Differential Input
Peak-to-Peak
Voltage
0.175
—
1.200
V
VRX-DIFFp-p = 2*|VRX-D+ - VRX-D-|
See Note 2.
TRX-EYE
Minimum
Receiver Eye
Width
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.
TRX-EYE-MEDIAN-to-MAX
-JITTER
Maximum time
between the jitter
median and
maximum
deviation from
the median.
—
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 7.
VRX-CM-ACp
AC Peak
Common Mode
Input Voltage
——
150
mV
VRX-CM-ACp = |VRXD+ +VRXD-|/2 -
VRX-CM-DC
VRX-CM-DC = DC(avg) of |VRX-D+ + VRX-D-|/2
See Note 2
RLRX-DIFF
Differential
Return Loss
15
—
dB
Measured over 50 MHz to 1.25 GHz with
the D+ and D- lines biased at +300 mV and
-300 mV, respectively.
See Note 4
RLRX-CM
Common Mode
Return Loss
6
—
dB
Measured over 50 MHz to 1.25 GHz with
the D+ and D- lines biased at 0 V. See Note
4
ZRX-DIFF-DC
DC Differential
Input Impedance
80
100
120
Ω
RX DC Differential mode impedance. See
Note 5
ZRX-DC
DC Input
Impedance
40
50
60
Ω
Required RX D+ as well as D- DC
Impedance (50 ± 20% tolerance). See
Notes 2 and 5.
ZRX-HIGH-IMP-DC
Powered Down
DC Input
Impedance
200 k
—
Ω
Required RX D+ as well as D- DC
Impedance when the Receiver terminations
do not have power. See Note 6.
VRX-IDLE-DET-DIFFp-p
Electrical Idle
Detect Threshold
65
—
175
mV
VRX-IDLE-DET-DIFFp-p = 2*|VRX-D+ -VRX-D-|
Measured at the package pins of the
Receiver
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