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參數(shù)資料
| 型號： | XRT4000 |
| 廠商： | Exar Corporation |
| 英文描述： | Universal Multiprotocol Serial Interface |
| 中文描述： | 通用多協(xié)議串行接口 |
| 文件頁數(shù)： | 16/46頁 |
| 文件大?。?/td> | 396K |
| 代理商： | XRT4000 |
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XRT4000
Rev. 1.00
- 16 -
SYSTEM DESCRIPTION
It is important to describe the difference
between an electrical specification and a
physical interface specification. An electrical
specification defines the electrical characteristics
of a transmitter or receiver. These include
voltage, current, impedance levels, rise/fall
times and other similar parameters. Popular
electrical interfaces are V.10, V.11, V.35 and
V.28. A serial physical interface specification,
however, describes an interface in its entirety.
This description includes the names and
functions of all involved signals, the electrical
parameters of each of the signals, and the
connector type. Popular serial interface types
include V.35, RS232 (V.28), RS449, EIA-530(A),
X.21, and V.36. The XRT4000 contains a
sufficient number of receivers, transmitters and
transceivers to transport all of the signals
required for a physical serial interface. It has
control circuitry that can configure each driver
and receiver to the appropriate electrical levels
required by the specification for the selected
serial interface.
Figure 1 is a top level block diagram that shows
how the eight receivers and eight transmitters
present in the XRT4000 are grouped in three
modules named RTMOD1, RTMOD2, and
RTMOD3. A forth module labeled CONTROL
programs these receivers and transmitters with
the appropriate electrical levels for operation
with most popular standard serial interfaces
such as V.35, RS232, RS449, EIA-530(A), X.21,
and V.36. These interfaces are fully compliant
with
international
specifications.
NET1
and
NET2
Figures 2, 3, 4, and 5 are a set of functional
block diagrams that give more
information about the four modules shown in the
top-level diagram. The eight receivers and
transmitters are grouped in three different
categories according to the type of signals
transmitted or received. The categories are
denoted as RTMOD1 (Figure 2), RTMOD2
(Figure 3), RTMOD3 (Figure 4), and CONTROL
(Figure 5).
detailed
RTMOD1 Block
RTMOD1 is intended for the high speed data
and clock signals of a selected interface. This
block contains receivers RX1 and RX2,
transmitters TX1 and TX2, and bi-directional
transceiver TR3 which is composed of TX3 and
RX3. All of these devices may be programmed
with the electrical levels required for V.35, V.11,
V.10, or V.28 operating modes. In V.35 mode,
each transmitter has a common mode pin that is
connected to the center of the internal
termination. This pin should be bypassed to
ground with an external capacitor in order to
provide the best possible driver output stage
balance. In a system application, the TX1-RX1
pair and TX2-RX2 pair handle the TXD-RXD and
TXC-RXC
high-speed
respectively. Transceiver TR3 is dedicated to
the SCTE signal for both DCE and DTE modes
of operation. It functions as a receiver for the
DTE mode and as a transmitter during the DCE
mode.
interface
signals
RTMOD2 Block
RTMOD2 contains receivers RX4 and RX5,
transmitters TX4 and TX5, and transceiver TR6
which is composed of TX6 and RX6. These
devices may be programmed with the electrical
levels required for V.11, V.10, or V.28 operating
modes. The RX4-TX4 pair are dedicated for
RTS and CTS signals while RX5-TX5 are
intended for DTR and DSR signals. Transceiver
TR3 handles the DCD signal which requires a
transmitter in the DCE and a receiver
DTE mode.
in-the-
RTMOD3 Block
RTMOD3 contains transceiver TR7, which is
composed of TX7 and RX7, receiver RX8 and
transmitter TX8. These devices, which may be
programmed with the electrical levels required
for V.10, or V.28 operating modes, are intended
for the LL, RL and RI signals.
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相關(guān)代理商/技術(shù)參數(shù) |
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| XRT4500CV | 制造商:EXAR 制造商全稱:EXAR 功能描述:MULTIPROTOCOL SERIAL NETWORK INTERFACE IC |
| XR-T5600P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PCM Repeater |
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