- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384760 > MT90820 (Mitel Networks Corporation) Large Digital Switch(大數(shù)字開關(guān)) PDF資料下載
參數(shù)資料
| 型號： | MT90820 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Large Digital Switch(大數(shù)字開關(guān)) |
| 中文描述： | 大型數(shù)字交換（大數(shù)字開關(guān)） |
| 文件頁數(shù)： | 5/33頁 |
| 文件大?。?/td> | 132K |
| 代理商： | MT90820 |
第1頁第2頁第3頁第4頁當(dāng)前第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁
CMOS
MT90820
5
-
1 - 4,
27 - 30,
51 - 54
77 - 80
NC
No connection.
Pin Description
Pin #
Name
Description
84
PLCC
100
MQFP
Device Overview
The MT90820 Large Digital Switch is capable of
switching up to 2,048
×
2,048 channels. The
MT90820 is designed to switch 64 kbit/s PCM or N x
64k bit/s data. The device maintains frame integrity
in data applications and minimum throughput delay
for voice applications on a per channel basis.
The serial input streams of the MT90820 can have a
bit rate of 2.048, 4.096 or 8.192 Mbit/s and are
arranged in 125
μ
s wide frames, which contain 32, 64
or 128 channels, respectively. The data rates on
input and output streams are identical.
By using Mitel’s message mode capability, the
microprocessor can access input and output
time-slots on a per channel basis. This feature is
useful for transferring control and status information
for external circuits or other ST-BUS devices. The
MT90820 automatically identifies the polarity of the
frame synchronization input signal and configures its
serial streams to be compatible to either ST-BUS or
GCI formats.
Two different microprocessor bus interfaces can be
selected through the Input Mode pin (IM):
Non-multiplexed or Multiplexed. These interfaces
provide compatibility with multiplexed and Motorola
non-multiplexed buses.
The frame offset calibration function allows users to
measure the frame offset delay using a frame
evaluation pin (FE). The input offset delay can be
programmed for individual streams using internal
frame input offset registers, see Table 11.
The internal loopback allows the ST-BUS output data
to be looped around to the ST-BUS inputs for
diagnostic purposes.
Functional Description
A functional Block Diagram of the MT90820 is shown
in Figure 1.
Data and Connection Memory
For all data rates, the received serial data is
converted
to
parallel
serial-to-parallel converters and stored sequentially
in the data memory. Depending upon the selected
operation programmed in the interface mode select
(IMS) register, the useable data memory may be as
large as 2,048 bytes. The sequential addressing of
the data memory is performed by an internal counter,
which is reset by the input 8 kHz frame pulse (F0i) to
mark the frame boundaries of the incoming serial
data streams.
format
by
internal
Data to be output on the serial streams may come
from either the data memory or connection memory.
Locations in the connection memory are associated
with particular ST-BUS output channels. When a
channel is due to be transmitted on an ST-BUS
output, the data for this channel can be switched
either from an ST-BUS input in connection mode, or
from the lower half of the connection memory in
message mode. Data destined for a particular
channel on a serial output stream is read from the
data memory or connection memory during the
previous channel time-slot. This allows enough time
for memory access and parallel-to-serial conversion.
Connection and Message Modes
In the connection mode, the addresses of the input
source data for all output channels are stored in the
connection memory. The connection memory is
mapped in such a way that each location
corresponds to an output channel on the output
streams. For details on the use of the source
address data (CAB and SAB bits), see Table 13 and
Table 14. Once the source address bits are
programmed by the microprocessor, the contents of
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MT90823 | 3V Large Digital Switch(3V 大數(shù)字開關(guān)) |
| MT90826 | Quad Digital Switch(四數(shù)字開關(guān)) |
| MT90840 | Distributed Hyperchannel Switch(分布式超級通道開關(guān)) |
| MT90863AL1 | 3V Rate Conversion Digital Switch |
| MT90863 | 3V Rate Conversion Digital Switch(3V 速率轉(zhuǎn)換數(shù)字開關(guān)) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT90820AL | 制造商:Microsemi Corporation 功能描述:SWIT FABRIC 2K X 2K/1K X 1K/512 X 512 131.072MBPS 5V 100MQFP - Trays |
| MT90820AL1 | 制造商:Microsemi Corporation 功能描述:SWIT FABRIC 2K X 2K/1K X 1K/512 X 512 131.072MBPS 5V 100MQFP - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC DGTL SWITCH 2048X2048 100MQFP 制造商:Microsemi Corporation 功能描述:IC DGTL SWITCH 2048X2048 100MQFP |
| MT90820AP | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Large Digital Switch |
| MT90820AP1 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Large Digital Switch |
| MT90820APR | 制造商:Microsemi Corporation 功能描述:SWIT FABRIC 2K X 2K/1K X 1K/512 X 512 5V 84PLCC - Tape and Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。