參數(shù)資料
型號(hào)： VSC870
廠商： VITESSE SEMICONDUCTOR CORP
元件分類： 通用總線功能
英文描述： High Performance Serial Backplane Transceiver
中文描述： LINE TRANSCEIVER, PBGA192
封裝： BGA-192
文件頁(yè)數(shù)： 27/40頁(yè)
文件大小： 511K
代理商： VSC870
VITESSE
Data Sheet
VSC870
High Performance Serial
Backplane Transceiver
G52190-0, Rev 4.1
01/05/01
Page 27
VITESSE
SEMICONDUCTOR CORPORATION
741 Calle Plano
Camarillo, CA 93012
Tel: (800) VITESSE
FAX: (805) 987-5896
Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Figure 10: Cell Based System
3.2 Data Encoding Format
The data word and command word format is described in section 1.0. These word formats are similar for both the
transceivers at the port cards and the transceivers at the controller chip. The BYPASS signal is set HIGH so the
RXTYP[1:0] and TXTYP[1:0] are the direct representation of the overhead bits (B[1:0]) in the serial channels. For
data words, the user can use these bits for signaling to the receiving port card. Information such as start of frame and
end of frame can be passed through the switch in this manner. At the serial interface, the data words must be
scrambled to increase the signal edge transition density by setting the SCRAM input HIGH. The scrambling pattern is
reset at cell clock. The transceiver checks the bit pattern on IDLE words to detect a link error condition. The encoding
for these data types is described in the following table.
3.3 Transmitter Operation
When BYPASS is set HIGH, all of the retransmit and self-routing functions in Packet Mode are disabled. The
CELLSYN input is set HIGH to allow the cell synchronization process. All words, either data words or command
TXTYP[1:0]
RXTYP[1:0]
B[1:0]
Datatypes
SCRAM = 1
SCRAM = 0
Error
Check
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
Command Word
No Scramble
No Scramble
IDLE word
Data Word
Scramble
No Scramble
No
Data Word
Scramble
No Scramble
No
Data Word
Scramble
No Scramble
No
Port Card
Trans
System
Queuing
Port Card
Trans
Switch
Chip
Switch Card
System
Queuing
Arbiter/
Scheduler
VSC870
VSC870
VSC880
Communication Bus
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