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)： 9/40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 9
VITESSE
SEMICONDUCTOR CORPORATION
741 Calle Plano
Camarillo, CA 93012
Tel: (800) VITESSE
FAX: (805) 987-5896
Email: prodinfo@vitesse.com
Internet: www.vitesse.com
1.2.1 Data Word Format at Transceiver Parallel Interface
Data words contain a 32 bit user defined payload which is sent between the transmitting and receiving port cards
as shown below. The RXTYP[1:0] and TXTYP[1:0] data word encoding format for different modes are described in
later sections.
Where:
D[31:0]32 bit data payload
1.2.2 Data Word Format on the Serial Data Lines
The data word format as seen at the serial output of the transceiver or switch chip is shown below. Two overhead
bits are added by the transceiver or switch chip to designate a data word to the receiving switch chip or transceiver.
The serial data is transmitted with the MSB first (B1, B0, D31, D30... D00).
Where:
B[1:0]If BYPASS=0,01=Flow control channel,
10=Flow control channel,
11=Acknowledge from switch chip or data header to switch chip
If BYPASS = 1, RXTYP[1:0]=B[1:0]=TXTYP[1:0]
D[31:0]32 bit data payload
1.2.3 Command Word Format at Transceiver Parallel Interface
There are several command words that are used for sending information to the switch chip or a receiving port
card. The command word format at the transceiver parallel interface is shown below. IDLE words are discussed in the
next sections. A delay enable value can also be programmed into the transceiver for Packet Mode using this
command word.
Where:
C[4:0]Command type:
00XXX=Link Control (00111=IDLE word)
01XX0=Command word for transceiver (01000=set DLYEN/CCKIN value)
10XX0=Command word for switch
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
D D D D
31 30 29 28
D D D D
27 26 25 24
D D D D
23 22 21 20
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
--------------- 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
B B
1 0
D D D D
31 30 29 28
D D D D
27 26 25 24
D D D D
23 22 21 20
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
--------------- Data Payload ----------------
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
X X X
C C C C C
04 03 02 01 00
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
X X X X
X X X X
-- Command --
-- Data --
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