參數(shù)資料
型號： MPC8548EPXAVHB
廠商： Freescale Semiconductor
文件頁數(shù)： 124/151頁
文件大?。?/td> 0K
描述： MPU POWERQUICC III 783-PBGA
產(chǎn)品培訓(xùn)模塊： MPC8548 PowerQUICC III Processors
標準包裝： 1
系列： MPC85xx
處理器類型： 32-位 MPC85xx PowerQUICC III
速度： 1.5GHz
電壓： 1.1V
安裝類型： 表面貼裝
封裝/外殼： 783-BBGA，F(xiàn)CBGA
供應(yīng)商設(shè)備封裝： 783-FCPBGA（29x29）
包裝： 托盤
MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 9
74
Freescale Semiconductor
PCI Express
Table 56. 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.
VTX-CM-DC-ACTIVE-
IDLE-DELTA
Absolute delta of
dc common
mode voltage
during L0 and
electrical idle
0—
100
mV
|VTX-CM-DC (during L0) + VTX-CM-Idle-DC (during
electrical idle)| 100 mV
VTX-CM-DC = DC(avg) of |VTX-D+ + VTX-D–|/2 [L0]
VTX-CM-Idle-DC = DC(avg) of |VTX-D+ +VTX-D–|/2
[electrical idle]
See Note 2.
VTX-CM-DC-LINE-DELTA Absolute delta of
DC common
mode between
D+ and D–
0—
25
mV
|VTX-CM-DC-D+ – VTX-CM-DC-D–| 25 mV
VTX-CM-DC-D+ = DC(avg) of |VTX-D+|
VTX-CM-DC-D–= DC(avg) of |VTX-D–|.
See Note 2.
VTX-IDLE-DIFFp
Electrical idle
differential peak
output voltage
0—
20
mV
VTX-IDLE-DIFFp = |VTX-IDLE-D+ – VTX-IDLE-D–|
20 mV.
See Note 2.
VTX-RCV-DETECT
The amount of
voltage change
allowed during
receiver
detection
—
600
mV
The total amount of voltage change that a
transmitter can apply to sense whether a low
impedance receiver is present. See Note 6.
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