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| 型號(hào)： | VSC880TY |
| 英文描述： | Interface IC |
| 中文描述： | 接口IC |
| 文件頁數(shù)： | 13/28頁 |
| 文件大?。?/td> | 289K |
| 代理商： | VSC880TY |
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VITESSE
Data Sheet
VSC880
High Performance 16x16
Serial Crosspoint Switch
G52191-0, Rev 4.2
01/05/01
Page 13
VITESSE
SEMICONDUCTOR CORPORATION
741 Calle Plano
Camarillo, CA 93012
Tel: (800) VITESSE
FAX: (805) 987-5896
Email: prodinfo@vitesse.com
Internet: www.vitesse.com
2.0 Packet Mode
2.1 Overview
In Packet Mode (CMODE=LOW), command words can be sent through the transceiver to the switch chip
requesting connection to one or multiple output channels. Acknowledge (ACK) information will be returned to the
transceiver from the switch allowing the port card to start transmitting data. In this mode of operation, no controller
chip is connected to the switch chip as the switch chip handles all arbitration for connection requests. Details on how
the transceiver operates in Packet Mode mode can be found in the VSC870 data sheet and the applications note 31:
“
Design Guide for a Packet Based Switch with Distributed Control
”
. A picture of a self routing system is shown
below. The minimum packet size in this mode of operation is 4 words or 16 bytes.
Figure 6: Packet Mode System
2.2 Data Encoding Format
The data word and command word formats are described in section 1.0. In this section the header word and
Connection Request (CRQ) word format at the serial input and serial output of the switch are described.
2.2.1 Header word Format on the Serial Data Lines
The header word format as seen at the serial output of the transceiver or switch chip is shown below. Two
overhead bits are added to designate a header word to the receiving chip. The serial data is transmitted with the MSB
first.
If multiple headers are sent in a row, the VSC870 will convert all but the first one into IDLEs.
Port Card
Trans
RXFIFO
TXFIFO
Port Card
Trans
RXFIFO
TXFIFO
Switch
Chip
Switch Card
VSC870
VSC870
VSC880
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