mpc8378 Freescale Semiconductor, Inc, mpc8378 Datasheet - Page 65

• Manufacturer Part Number: mpc8378
• Description: Powerquicc Ii Pro Processor
• Manufacturer: Freescale Semiconductor, Inc

Unit interval
Differential peak-to-peak
output voltage
transition bit or a de-emphasized bit. The exact reduced voltage level of the de-emphasized bit is always
relative to the transition bit.
The eye diagram must be valid for any 250 consecutive UIs.
A recovered Tx UI is calculated over 3500 consecutive unit intervals of sample data. The eye diagram is
created using all edges of the 250 consecutive UI in the center of the 3500 UI used for calculating the Tx
UI.
15.4.3
Table 53
at the component pins.
Freescale Semiconductor
Parameter
defines the specifications for the differential input at all receivers. The parameters are specified
Figure 42. Minimum Transmitter Timing and Voltage Output Compliance Specifications
Differential Receiver (Rx) Input Specifications
It is recommended that the recovered Tx UI be calculated using all edges in
the 3500 consecutive UI interval with a fit algorithm using a minimization
merit function (that is, least squares and median deviation fits).
MPC8377E PowerQUICC II Pro Processor Hardware Specifications, Rev. 3
Each U
ppm. U
for Spread Spectrum Clock
dictated variations.
V
V
PEDPPRX
RX-D-
Table 53. Differential Receiver (Rx) Input Specifications
(D+ D– Crossing Point)
|
PERX
PERX
V
Comments
TX-DIFF
= 2 × |V
does not account
is 400 ps ± 300
= 0 mV
566 mV (3 dB) >= V
RX-D+
0.7 UI = UI – 0.3 UI(J
–
V
V
[De-emphasized Bit]
TX-DIFFp-p-MIN
TX-DIFFp-p-MIN
[Transition Bit]
[Transition Bit]
NOTE
TX-DIFFp-p-MIN
V
RX-DIFFp-p
Symbol
= 800 mV
= 800 mV
UI
TX-TOTAL-MAX
>= 505 mV (4 dB)
(D+ D– Crossing Point)
)
399.88
V
0.175
Min
TX-DIFF
= 0 mV
Typical
400
—
400.12
1.200
Max
Units
ps
V
PCI Express
Notes
1
2
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