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參數資料
| 型號： | VSC830 |
| 廠商： | Vitesse Semiconductor Corporation. |
| 英文描述： | 2.7Gb/s Asynchronous Dual 2x2 Crosspoint Switch |
| 中文描述： | 2.7Gb / s的異步雙2x2交叉點開關 |
| 文件頁數： | 17/18頁 |
| 文件大小： | 195K |
| 代理商： | VSC830 |
VITESSE
Data Sheet
VSC830
Dual 2x2 Crosspoint Switch
2.7Gb/s Asynchronous
G52192-0, Rev 4.0
05/23/01
Page 17
VITESSE
SEMICONDUCTOR CORPORATION
741 Calle Plano
Camarillo, CA 93012
Tel: (800) VITESSE
FAX: (805) 987-5896
Email: prodinfo@vitesse.com
Internet: www.vitesse.com
High-Speed Serial I/O Layout Considerations
The high-speed serial signals contain digital data at fundamental frequencies up to 2.488GHz clock rate.
Given that, in order to preserve the edges of such data sequences, it is necessary to have excellent frequency and
phase response up to at least the 3
rd
harmonic, if not the 7
th
harmonic. Improved signal quality will result should
the reader follow the general design rules below:
1.
Keep traces as short as possible. Initial component placement should be very carefully considered.
2.
The impedance of the traces must match that of the terminations, connectors and cable(s) in order to reduce
reflections and impedance mismatches. Reflections can create standing waves that will increase the signal
jitter.
Differential transmission line impedance must be maintained at 100
.
When routing differential pairs, keep the lengths identical for both traces. Differences in trace length trans-
late directly into signal skew and can add to the signal jitter. Remember also that the differential impedance
is affected by the separation between the traces.
3.
4.
5.
Keep differential pair traces on the same side of the PCB to minimize impedance discontinuity, such as the
one caused when using printed-circuit board vias.
6.
Eliminate or reduce stubs.
Use rounded corners rather than 45
°
or 90
°
corners.
Keep signal traces far from other signals which might capacitively couple noise into the signals. This
includes the other trace of a differential pair or the traces of the parallel PECL or TTL interface.
7.
8.
9.
Do not cut up the power or ground planes in an effort to steer current paths. This usually produces more
noise, not less.
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