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參數(shù)資料
| 型號： | VT6304 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 1394.A 4 PORT PHYSICAL LAYER CHIP |
| 中文描述： | 1394.A 4端口物理層芯片 |
| 文件頁數(shù)： | 9/21頁 |
| 文件大小： | 126K |
| 代理商： | VT6304 |
VIA Technologies, Inc.
Preliminary VT6304
9
F
UNCTIONAL
D
ESCRIPTIONS
1. G
ENERAL
D
ESCRIPTION
The VT6304 provides three-port physical layer function in a cable-based IEEE 1394-1995 network. Each
cable port incorporates two differential line transceivers. The transceivers include circuitry to monitor the
line conditions as needed for determining connection status, for initialization and arbitration, and for packet
reception and transmission.
Data bits to be transmitted through the cable ports are received from the Link on 2/4/8 data lines (D[0:7]),
and are latched internally in the VT6304 in synchronization with the 49.152-MHZ system clock. These bits
are combined serially, encoded, and transmitted at 98.304 , 196.608 or 393.216 Mbits/S as the outbound
data-strobe information stream. During transmission, the encoded data transmitted differential on the TPB
cable pair(s), and the encoded strobe information is transmitted differentially on the TPA cable pair(s).
During packet reception the TPA and TPB transmitters of the receiving cable port are disabled, and the
receivers for that port are enabled. The encoded data information is received on the TPA cable pair, and the
encoded Strobe information is received on the TPB cable pair. The received data-strobe information is
decoded to recover the receive clock signal and the serial data bits. The serial data bits are split into two or
four parallel transmitted (repeated) out of the other active (connected) cable ports.
Both the TPA and TPB cable interfaces incorporate differential comparators to monitor the line states during
initialization and arbitration. The output of these comparators are used by the internal logic to determine the
arbitration status. The TPA channel monitors the incoming cable common-mode voltage. The value of this
common mode voltage is used during arbitration to set the speed of the next packet transmission. In
addition, the TPB channel monitors the incoming cable common-mode voltage for the presence of the
remotely supplied twisted-pair bias voltage. The presence or absence of this common-mode voltage is used as
an indication of cable connection status. The cable connection status signal is internally debounced in the
VT6304 on a cable disconnect-to-connect. The debounced cable connection status signal initiates a bus reset.
On a cable disconnect-to-connect a debounce delay is incorporated. There is no delay on a cable disconnect.
2. N
ETWORK
I
NTERFACE
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| VT6305 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PCI 1394 Host Controller |
| VT6508 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8 RMII PORTS OF 10/100BASE-T/TX ETHERNET SWITCH CONTROLLER |
| VT6510B | 制造商:VIA 功能描述: |
| VT6516 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:16/12 PORT 10/1000 ASE T/TX |
| VT-6-6 | 制造商:Panduit Corp 功能描述:BOLT TERM 70MM 57MM - Bulk 制造商:Panduit Corp 功能描述:Bolt Terminal 70mm 57mm |
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