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參數(shù)資料
| 型號： | VSC880TY |
| 英文描述： | Interface IC |
| 中文描述： | 接口IC |
| 文件頁數(shù)： | 14/28頁 |
| 文件大?。?/td> | 289K |
| 代理商： | VSC880TY |
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VITESSE
Data Sheet
VSC880
High Performance 16x16
Serial Crosspoint Switch
Page 14
G52191-0, Rev 4.2
01/05/01
VITESSE
SEMICONDUCTOR CORPORATION
741 Calle Plano
Camarillo, CA 93012
Tel: (800) VITESSE
FAX: (805) 987-5896
Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Where:
A[1:0]11=to switch chip, 00=from switch chip
B[1:0]00=Undefined,
01=Flow control channel,
10=Flow control channel,
11=Acknowledge to transceiver
D[19:0]20 bit data payload
2.2.2 CRQ Word Format on the Serial Data Lines to the Switch
The CRQ command word format as seen at the output of the transceiver is shown below. Two overhead bits are
added by the transceiver to designate a CRQ word to the receiving switch chip. The signal ARB, AOA and BRK are
used to control modes of operation in the switch chip. The serial data is transmitted with the MSB first.
Where:
B[1:0]00=Undefined,
01=Flow control channel,
10=Flow control channel,
11=Undefined
ARB1=Multi Queue arbitration
AOA1=Acknowledge on all connections granted, 0=Acknowledge on any connections granted
BRK 1=Break previous connection, 0=Do not break previous connection
C[0:15] Connection request bit map. Set bit high for each output requested
D[3:0] User defined data sent by transmitting port card
2.2.3 CRQ Word Format on the Serial Data Line From the Switch
The CRQ command word format as seen at the output of the switch chip is shown below. Two overhead bits are
added by the switch chip to designate a command word (00) to the transceiver. This word is sent on to the receiving
port card when an ACK is sent to the transmitting port card. The command word contains the current active
connections for this input in the switch chip. The serial data is transmitted with the MSB first.
33 32
31 30 29 28
27 26 25 24
23 22 21 20
19 18 17 16
15 14 13 12
11 10 09 08
07 06 05 04
03 02 01 00
A A
1 0
0 B B 1
1 0
0 1 1 0
D D D D
19 18 17 16
D D D D
15 14 13 12
D D D D
11 10 09 08
D D D D
07 06 05 04
D D D D
03 02 01 00
1 0 1 0
--------------- Data Payload ----------------
33 32
31 30 29 28 27
26 25 24
23 22 21 20
19 18 17 16
15 14 13 12
11 10 09 08
07 06 05 04
03 02 01 00
0 0
0 B B 1 0
1 0
A A B
R O R
C C C C
00 01 02 03
C C C C
04 05 06 07
C C C C
08 09 10 11
C C C C
12 13 14 15
D D D D
03 02 01 00
1 0 1 0
B A K
------ Connection Bits ------
--Data--
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