參數(shù)資料
型號： MPC8548EHXAVJB
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 1500 MHz, MICROPROCESSOR, CBGA783
封裝： 29 X 29 MM, 1 MM PITCH, FLIP CHIP, CERAMIC, BGA-783
文件頁數(shù)： 109/142頁
文件大?。?/td> 1504K
代理商： MPC8548EHXAVJB
MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5
Freescale Semiconductor
69
PCI Express
16.3
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.
16.4
Physical Layer Specifications
The 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 refer to PCI Express Base
Specification. Rev. 1.0a.
16.4.1
Differential Transmitter (TX) Output
Table 52 defines the specifications for the differential output at all transmitters (TXs). The parameters are
specified at the component pins.
Table 52. Differential Transmitter (TX) Output Specifications
Symbol
Parameter
Min
Nom
Max
Unit
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.
VTX-DIFFp-p
Differential
peak-to-peak
output voltage
0.8
—
1.2
V
VTX-DIFFp-p = 2*|VTX-D+ – VTX-D–|. See Note 2.
VTX-DE-RATIO
De- emphasized
differential
output voltage
(ratio)
–3.0
–3.5
–4.0
dB
Ratio of the VTX-DIFFp-p of the second and
following bits after a transition divided by the
VTX-DIFFp-p of the first bit after a transition.
See Note 2.
TTX-EYE
Minimum TX eye
width
0.70
—
UI
The maximum transmitter jitter can be derived as
TTX-MAX-JITTER = 1 – TTX-EYE = 0.3 UI.
See Notes 2 and 3.
TTX-EYE-MEDIAN-to-
MAX-JITTER
Maximum time
between the
jitter median and
maximum
deviation from
the median.
—
0.15
UI
Jitter is defined as the measurement variation of
the crossing points (VTX-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 and 3.
TTX-RISE, TTX-FALL
D+/D– TX output
rise/fall time
0.125
—
UI
See Notes 2 and 5.
VTX-CM-ACp
RMS AC peak
common mode
output voltage
——
20
mV
VTX-CM-ACp = RMS(|VTXD+ + VTXD–|/2 –
VTX-CM-DC)
VTX-CM-DC = DC(avg) of |VTX-D+ + VTX-D–|/2.
See Note 2.
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