參數(shù)資料
型號(hào)： VSC837
廠商： Vitesse Semiconductor Corporation.
英文描述： 3.2Gb/s 68x68 Crosspoint Switch
中文描述： 達(dá)3.2GB / s的68x68交叉點(diǎn)開關(guān)
文件頁(yè)數(shù)： 2/26頁(yè)
文件大小： 340K
代理商： VSC837
VITESSE
Preliminary Data Sheet
VSC837
3.2Gb/s
68x68 Crosspoint Switch
Page 2
G52309-0, Rev 3.0
02/16/01
VITESSE
SEMICONDUCTOR CORPORATION
741 Calle Plano
Camarillo, CA 93012
Tel: (800) VITESSE
FAX: (805) 987-5896
Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Functional Block Diagram
Functional Description
Input / Output Characteristics
All input data must be differential and should be nominally biased to +2.0V or AC-coupled. Other levels
are allowed as described under the
Input Termination
section. On-chip terminations are provided, with a nomi-
nal impedance of 100
differential. All input termination resistors float with an internal bias provided for AC-
coupling.
For direct interconnection of multiple VSC837 devices, a CML termination mode is provided by tying the
ITC pin to V
CC
, which ties the center point of the 100
termination to V
CC
, causing the terminations to act as
loads for an open-drain or open-collector differential output.
Data outputs are provided through differential current switches with on-chip back-termination. The output
circuit is capable of driving external 50
far-end termination (recommended). The output back-terminations are
electronically switchable to enable a power savings of 2W (max) by reducing the output driver current.
68x69 Switch Core
Core Program Registers
CONFIG
INITB
Internal 69
th
Output
A, AN[0:67]
S
S
B
C
L
A
Y, YN[0:67]
O
I
Program Memory
Program Interface
A
A
Activity
Monitor
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