MSC8157ETVT1000A Freescale Semiconductor, MSC8157ETVT1000A Datasheet - Page 77

• Manufacturer Part Number: MSC8157ETVT1000A
• Description: Digital Signal Processors & Controllers - DSP, DSC Qual 8157 EN FG 1GHz -45 to 105c
• Manufacturer: Freescale Semiconductor

Specifications of MSC8157ETVT1000A

• Rohs: yes
• Core: SC3850
• Data Bus Width: 32 bit
• Program Memory Size: 32 KB
• Data Ram Size: 512 KB
• Number Of Programmable I/os: 32
• Number Of Timers: 2
• Operating Supply Voltage: 0.97 V to 1.05 V
• Maximum Operating Temperature: + 105 C
• Package / Case: FCPBGA-783
• Mounting Style: SMD/SMT

Freescale Semiconductor
At recommended operating conditions (see
Unit Interval
Minimum receiver eye
width
Maximum time between
the jitter median and
maximum deviation from
the median.
Notes:
Parameter
1.
2.
3.
4.
Table 34. PCI Express 2.0 (2.5 Gbps) Differential Receiver (Rx) Input AC Specifications
No test load is necessarily associated with this value.
Specified at the measurement point and measured over any 250 consecutive UIs. The test load in
the Rx device when taking measurements. If the clocks to the Rx and Tx are not derived from the same reference clock, the Tx
UI recovered from 3500 consecutive UI must be used as a reference for the eye diagram.
A T
interconnect collected any 250 consecutive UIs. The TRX-EYE-MEDIAN-to-MAX-JITTER specification ensures a jitter
distribution in which the median and the maximum deviation from the median is less than half of the total. UI jitter budget
collected over any 250 consecutive Tx UIs. It should be noted that the median is not the same as the mean. The jitter median
describes the point in time where the number of jitter points on either side is approximately equal as opposed to the averaged
time value. If the clocks to the Rx and Tx are not derived from the same reference clock, the Tx UI recovered from 3500
consecutive UI must be used as the reference for the eye diagram.
It is recommended that the recovered Tx UI is calculated using all edges in the 3500 consecutive UI interval with a fit algorithm
using a minimization merit function. Least squares and median deviation fits have worked well with experimental and simulated
data.
RX-EYE
= 0.40 UI provides for a total sum of 0.60 UI deterministic and random jitter budget for the Transmitter and
T
RX-EYE-MEDIAN-t
MSC8157 Six-Core Digital Signal Processor Data Sheet, Rev. 1
o-MAX-JITTER
Symbol
T
RX-EYE
UI
Table
4).
399.88 400.00 400.12
Min
0.4
—
Nom
—
—
Max
0.3
—
Units
ps
UI
UI
Each UI is 400 ps ± 300 ppm. UI does not
account for spread spectrum clock dictated
variations. See note 1.
The maximum interconnect media and
Transmitter jitter that can be tolerated by the
Receiver can be derived as
T
notes 2 and 3.
Jitter is defined as the measurement
variation of the crossing points
(V
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 4.
RX-MAX-JITTER
RX-DIFFp-p
= 0 V) in relation to a recovered
= 1 – T
Comments
Electrical Characteristics
Figure 15
RX-EYE
should be used as
= 0.6 UI. See
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