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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 13/40頁 |
| 文件大小： | 511K |
| 代理商： | VSC870 |
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VITESSE
Data Sheet
VSC870
High Performance Serial
Backplane Transceiver
G52190-0, Rev 4.1
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
2.2.1 Packet Format
At both the transmit and receive sides, a start of packet is identified using a header word with TXTYP[1:0] and
RXTYP[1:0] set to
“
10
”
. Following this header word are the rest of the data words with TXTYP[1:0] and
RXTYP[1:0] set to
“
01
”
. This is shown in the table below.
Two general ways of transmitting a data packets are shown in the figure below. In the first example, when the
transceiver reads a CRQ word (which signals the start of a new packet) it waits for the ACK signal before
transmitting the header word. In the second example, the CRQ word is sent D words before the end of the packet in
order to utilize early arbitration and optimize the throughput. If there is no available packet for the next transmission,
a null CRQ word and a null header word are used as end of packet. Command words such as IDLEs can be
embedded inside the packet. On the receive side, the packets are delineated by the header word at the beginning and a
CRQ word at the end. The word sequence loaded into the VSC870 parallel interface is also shown in the figure below.
More details can be found in Application Note 31.
Figure 2: Packet Transmission Format
TXTYP[1:0]
RXTYP[1:0]
Transmit
B[1:0]
Receive
B[1:0]
Word Type
SCRAM = 1
SCRAM = 0
Error Check
0 0
0 1
1 0
1 1
0 0
0 0
Command Word
No Scramble
No Scramble
IDLE words
01 or 10
1 1
0 0
01,10,11
0 0
0 0
Data Word
Scramble
No Scramble
No
Header Word
No Scramble
No Scramble
No
Connection Request
No Scramble
No Scramble
No
11
10
01
Header
D0
10
01
01
Header
D0
D1
01
DN
CRQ
Example 1
Start of Packet
End of Packet
Start of Packet
10
01
Header
D0
01
10
01
DN
11
01
D(N-D)
Header
D0
Example 2
Start of Packet
End of Packet
Start of Packet
D words before EOP
CRQ
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相關(guān)代理商/技術(shù)參數(shù) |
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| VSC870TX | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:High Performance Serial Backplane Transceiver |
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