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| 型號： | MT8980 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁數(shù)： | 7/11頁 |
| 文件大小： | 80K |
| 代理商： | MT8980 |
Application Note
MSAN-123
A-111
4.1 Switching Mode
A delay through the MT8980 results when
transferring channel information from an ST-BUS
input stream to an output stream. The input
information must first be transferred to the Data
Memory, where it waits until the next available
timeslot allocated to the output channel. Recalling
the definition of the ST-BUS, 32 channels arrive at an
input and 32 channels leave an output. Each
channel is allocated one timeslot per frame, so there
are 31 timeslots intervening between each timeslot
allocated to a particular channel. If the information
has just missed an appropriate timeslot for the
output channel, it may have to wait a number of
timeslots for the next allocated channel time.
The last bit of a channel is received before the
channel information is said to have entered the
MT8980 and is sent to the Data Memory.
Consequently, a channel’s information is sent to Data
Memory during the timeslot immediately following a
timeslot allocated to the channel. Conversely,
channel information is queued for an output channel
during the timeslot immediately preceding a timeslot
allocated to the channel.
The implication of this ordering of events is that
information entering the MT8980 cannot leave it in
the same timeslot, or in the timeslot immediately
following. Therefore, information that is to be output
in the same channel position as the information is
input, relative to frame pulse, will be output in the
following frame. As well, information switched to the
channel immediately following the input channel will
not be output in the timeslot immediately following
but in the next timeslot allocated to the output
channel, one frame later. Examples of channels
being switched to the channels immediately following
are: switching from Channel 1 to Channel 2, Channel
4 to Channel 5, Channel 30 to Channel 31, Channel
31 to Channel 0 etc. All of the channel changes
mentioned above are independent of stream
changes.
Whether the information can be output during the
second timeslot after the information entered the
MT8980 depends on which ST-BUS stream the
channel information enters on and which ST-BUS
stream the information leaves on. This situation is
caused by the order in which input stream
information is placed into Data Memory and the
order in which stream information is queued for
output.
Table
1
shows
streamcombinations that would allow information to
leave on the second timeslot after the information
was received.
the
input/output
Table 1. Input Stream to Output Stream
Combinations that can Provide the
Minimum 2 Channel Delay
Table 2. Minimum Setup Times for Writing
to a Channel in Message Mode (Relative to
the Start of the Channel)
.
Table 3. Minimum Delays for Reading Input
Channels from Microprocessor Port. Delay
is Relative to End of Channel
Information can always leave the MT8980 by the
third
timeslot
after
entering
independent of which stream it is input on and which
the
MT8980,
Input Stream
Output Stream
0
1,2,3,4,5,6,7
1
3,4,5,6,7
2
5,6,7
3
7
4
1,2,3,4,5,6,7
5
3,4,5,6,7
6
5,6,7
7
7
Output Stream
Minimum Setup time
0
t
CLK
×
19
t
CLK
×
19
t
CLK
×
15
t
CLK
×
15
t
CLK
×
11
t
CLK
×
11
t
CLK
×
7
t
CLK
×
7
1
2
3
4
5
6
7
Input Stream
Minimum Delays
0
t
CLK
×
1
t
CLK
×
5
t
CLK
×
9
t
CLK
×
13
t
CLK
×
1
t
CLK
×
5
t
CLK
×
9
t
CLK
×
13
1
2
3
4
5
6
7
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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