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MT90710AP Datasheet(PDF) 8 Page - Mitel Networks Corporation

Part # MT90710AP
Description  High-Speed Isochronous Multiplexer
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Manufacturer  MITEL [Mitel Networks Corporation]
Direct Link  http://www.mitel.com
Logo MITEL - Mitel Networks Corporation

MT90710AP Datasheet(HTML) 8 Page - Mitel Networks Corporation

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MT90710
Preliminary Information
5-10
required. This is implemented using an external 8x8
static RAM (35 ns). Only 256 bytes are used of the
8K total. RAM address and data (FBADDR0-7 and
FBDATA0-7) signals are generated along with an
output enable strobe (FBOE) and a write enable
strobe (FBWE).
Table 1 - Operational Mode Select
Overhead Information
Fiber Interface
Eight of the 256 fiber channels are reserved for
overhead information. These are fiber channels:
Channel #
Function
0
Frame Alignment
8
Asynchronous
signal
transfer
and
synchronization detect
16
Checksum of previous frame
24
Reserved
32
Reserved
40
Reserved
48
Remote error count most significant byte
56
Remote error count least significant byte
Mode # Mode 2 Mode 1 Mode 0
ST6MUX
Configuration
0
0
0
0
ENABLED
CONTROLLER
1
0
0
1
ENABLED
PERIPHERAL
2
0
1
0
not used
not used
3
0
1
1
DISABLED CONTROLLER
4
1
0
0
not used
not used
5
1
0
1
not used
not used
6
1
1
0
not used
not used
7
1
1
1
DISABLED
PERIPHERAL
ST-BUS Interface
The first nine STo7 channels are reserved for
overhead information:
STo7 Channel
Function
0
not available
1
not available
2
Reserved
3
Local error count
(most significant byte)
4
Local error count
(least significant byte)
5
Reserved
6
Remote error count
(most significant byte)
7
Remote error count
(least significant byte)
8
synchronization detect
(see STo7 channel 8 definition)
STo7 Channel 8 Definition:
B7
remote receiver is in frame synch
when logic 1
B6
Local receiver is in frame synch
when logic 1
B5, B4, B3
Reserved
B2, B1, B0
Reserved
ST6MUX
ST-BUS to Fiber
When ST6MUX is enabled the STi6A and STi6B
input streams are alternately multiplexed onto the
fiber link. (i.e., only half of the bandwidth of each link
is utilized). The transmit pattern at the fiber interface
is:
STi6A-Chan0,STi6B-Chan1,STi6A-Chan2,STi6B-Chan3,...,
STi6B-Chan29,STi6A-Chan30,STi6B-Chan31
Multiplexed Stream
Chan 0
Chan 1
Chan 2
Chan 3
Chan 4
Chan 5
.....
Chan 28
Chan 29
Chan 30
Chan 31
STo6A Data from STi6A
Chan 0
Chan 0
Chan 2
Chan 2
Chan 4
Chan 4
.....
Chan 28
Chan 28
Chan 30
Chan 30
STo6B Data from STi6B
Chan 1
Chan 1
Chan 3
Chan 3
Chan 5
Chan 5
.....
Chan 29
Chan 29
Chan 31
Chan 31
Table 2 - ST6MUX Channel Assignment


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