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參數(shù)資料
| 型號(hào)： | MT8980 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁數(shù)： | 2/11頁 |
| 文件大?。?/td> | 80K |
| 代理商： | MT8980 |
MSAN-123
Application Note
A-106
emphasize
integration of voice, video and data.
distributed
architectures
and
the
The principle applications of the MT8980/81 are:
a)
Switching.
The MT8980/81 provides non-
blocking switching of information channels
(circuit switching). The main difference between
the MT8980 and the MT8981 is that the MT8980
has a 256 channel capacity and the MT8981 has
a 128 channel capacity. Each channel has a
throughput capacity of 64 kbit/s. Channels may
carry any form of digitized signal, from encoded
voice or data to digitized video.
The MT8980/81 can provide a communication
path between any pair of nodes connected to the
MT8980/81 through ST-BUS streams. As well,
the MT8980/81 can place its ST-BUS outputs
into a high impedance state on a per channel
basis,
so
that
larger
constructed.
matrices
may
be
b)
ST-BUS Device Control.
When the MT8980/81
is in Message mode, each ST-BUS channel input
or output looks like a parallel register to the
controlling microprocessor. Each of these input
channels or output channels can map directly
into the status register, or the control register of
a “remote” ST-BUS device connected to the
MT8980/81. An individual MT8980 can read up
to 256 status registers and write up to 256
control registers.
c)
Interprocessor Communication.
The ability to
provide
communication
microprocessors is a subset of the previous
application. In this case, the remote ST-BUS
device is another MT8980/81 which is controlled
by another microprocessor. This microprocessor
is also sending and receiving information on ST-
BUS channels in Message mode. The channel
that the remote microprocessor is receiving on
appears to the “l(fā)ocal” microprocessor as a
control register of an ST-BUS device appeared in
the previous application. The channel that the
remote microprocessor is sending on appears to
paths
between
the local microprocessor as a status register of
an ST-BUS device appeared in the previous
application.
The above applications are discussed in more detail
in a subsequent application note.
This application note deals with the relationship
between the ST-BUS and the MT8980/81. Other
MT8980/81 topics covered are: microprocessor
interfacing, the two major modes of the device
(Switching mode and Message mode), the delay that
the
MT8980/81
inserts
communication, and miscellaneous details about
MT8980/81 operation.
into
end-to-end
2.0 The ST-BUS
The ST-BUS is a component interface. It minimizes
the pin requirements on devices and backplanes by
using time division multiplexing to transfer a number
of logical data channels through a single wire or pin.
A circuit’s ST-BUS interface consists of two control
signals and as many input and output streams as are
needed to provide the bandwidth required by the
circuit to perform its function (usually one input
stream and one output stream for information to be
processed, and one input and output stream for
control and status information).
The standard bit rate of the ST-BUS is 2.048 Mbit/s.
The overall bit stream is divided into intervals called
frames, yielding a frame rate of approximately 8000
frames/s. Each frame is divided into 256 intervals,
each containing one bit of digital information. For
most communications applications, the bit stream is
also divided into 32 intervals per frame called
channels. Each channel is allotted eight bits, for a
per channel data rate of:
8000 frames /sX8 bits/frame=64 kbit/s.
Channels are referenced to the start of the frame
and are numbered from zero to 31.
Figure 2 - F0i, C4i and ST-BUS Alignment
F0
C4
BITS
CHANNELS
7
6
5
4
3
2
1
0
7
0
31
0
512 CYCLES OF C4
0
7
6
5
4
3
2
1
0
7
0
6
5
4
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MT8982 | ISO-CMOS ST-BUS⑩ FAMILY Small Digital Switch (MiniDX) |
| MT8982AC | ISO-CMOS ST-BUS⑩ FAMILY Small Digital Switch (MiniDX) |
| MT8982AE | ISO-CMOS ST-BUS⑩ FAMILY Small Digital Switch (MiniDX) |
| MT8982AN | ISO-CMOS ST-BUS⑩ FAMILY Small Digital Switch (MiniDX) |
| MT8982AS | ISO-CMOS ST-BUS⑩ FAMILY Small Digital Switch (MiniDX) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT8980D | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:ISO-CMOS ST-BUS Family Digital Switch |
| MT8980D-1 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO-CMOS ST-BUS⑩ FAMILY Digital Switch |
| MT8980DE | 制造商:Microsemi Corporation 功能描述:SWIT FABRIC 256 X 256 5V 40PDIP - Rail/Tube 制造商:Zarlink Semiconductor Inc 功能描述:SWIT FABRIC 256 X 256 5V 40PDIP - Rail/Tube |
| MT8980DE1 | 制造商:Microsemi Corporation 功能描述:SWIT FABRIC 256 X 256 5V 40PDIP - Rail/Tube 制造商:Microsemi Corporation 功能描述:PB FREE DIGITAL SWITCH 制造商:Zarlink Semiconductor Inc 功能描述:SWIT FABRIC 256 X 256 5V 40PDIP - Rail/Tube 制造商:Zarlink Semiconductor Inc 功能描述:PB FREE DIGITAL SWITCH |
| MT8980DP | 制造商:Mitel Networks Corporation 功能描述: 制造商:ZARLINK 功能描述: 制造商:Zarlink Semiconductor Inc 功能描述: |
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