參數(shù)資料
型號(hào)： TSB21LV03BI
廠商： Texas Instruments, Inc.
英文描述： IEEE 1394-1995 Triple-Cable Transceiver/Arbiter(IEEE1394-1995 三電纜收發(fā)器/判優(yōu)器)
中文描述： 電機(jī)及電子學(xué)工程師聯(lián)合會(huì)1394-1995三線收發(fā)器/仲裁器（IEEE1394連接- 1995三電纜收發(fā)器/判優(yōu)器）
文件頁(yè)數(shù)： 2/25頁(yè)
文件大?。?/td> 351K
代理商： TSB21LV03BI
TSB21LV03BI
IEEE 1394-1995 TRIPLE-CABLE TRANSCEIVER/ARBITER
SGLS108 – FEBRUARY 1999
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description (continued)
Data bits to be transmitted through the cable ports are received from the LLC on two or four data lines (D0 –
D3), and are latched internally in the TSB21LV03B in synchronization with the 49.152-MHz system clock. These
bits are combined serially, encoded, and transmitted at 98.304 or 196.608 Mbits/s as the outbound data-strobe
information stream. During transmission, the encoded data information is transmitted differentially 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
streams, resynchronized to the local system clock, and sent to the associated LLC. The received data is also
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 outputs 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 TSB21LV03B on a
cable disconnect-to-connect. The debounced cable connection status signal initiates a bus reset. After a cable
disconnect-to-connect, a debounce delay is initiated. There is no delay on a cable disconnect.
The TSB21LV03B provides a 1.86-V nominal bias voltage for driver load termination. This bias voltage, when
seen through a cable by a remote receiver, indicates the presence of an active connection. The value of this
bias voltage has been chosen to allow interoperability between transceiver chips operating from either 5-V or
3-V nominal supplies. This bias voltage source should be stabilized by using an external filter capacitor of
approximately 1.0
μ
F.
The transmitter circuitry is disabled under the following conditions: power down, cable not active, reset, or
transmitter disable. The receiver circuitry is disabled under the following conditions: power down, cable not
active, or receiver disable. The twisted-pair bias voltage circuitry is disabled under the following conditions:
power down or reset. The power-down condition occurs when the PD input is high. The cable-not-active (CNA)
condition occurs when the cable connection status indicates that no cable is connected. The reset condition
occurs when the RESET input terminal is low. The transmitter disable and receiver disable conditions are
determined from the internal logic.
The line drivers in the TSB21LV03B operate in a high-impedance current mode and are designed to work with
external 110-
line-termination resistor networks. One network is provided at each end of each twisted-pair
cable. Each network is composed of a pair of series-connected 55-
resistors. The midpoint of the pair of
resistors that is directly connected to the twisted-pair A (TPA) package terminals is connected to the TPBIAS
voltage terminal. The midpoint of the pair of resistors that is directly connected to the twisted-pair B (TPB)
package terminals is coupled to ground through a parallel RC network with recommended resistor and capacitor
values of 5 K
and 250 pF respectively. The values of the external resistors are designed to meet the draft
standard specifications when connected in parallel with the internal receiver circuits and are shown in Figure 3.
The driver output current, along with other internal operating currents, is set by an external resistor. This resistor
is connected between the R0 and R1 terminals and has a value of 6.3 k
,
±
0.5%.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TSB21LV03C 制造商:TI 制造商全稱:Texas Instruments 功能描述:IEEE 1394-1995 TRIPLE-CABLE TRANSCEIVER/ARBITER
TSB21LV03CHV 制造商:TI 制造商全稱:Texas Instruments 功能描述:IEEE 1394-1995 TRIPLE-CABLE TRANSCEIVER/ARBITER
TSB21LV03CMHV 制造商:Rochester Electronics LLC 功能描述:- Bulk
TSB21LV03CMHVB 制造商:Rochester Electronics LLC 功能描述:- Bulk
TSB21LV03CPM 制造商:TI 制造商全稱:Texas Instruments 功能描述:IEEE 1394-1995 TRIPLE-CABLE TRANSCEIVER/ARBITER
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