MT90710 Просмотр технического описания (PDF) - Mitel Networks

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MT90710

High-Speed Isochronous Multiplexer

Mitel Networks 

MT90710

Preliminary Information

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).

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

Table 1 - Operational Mode Select

ST-BUS Interface

The first nine STo7 channels are reserved for

overhead information:

STo7 Channel

0

1

2

3

4

5

6

7

8

Function

not available

not available

Reserved

Local error count

(most significant byte)

Local error count

(least significant byte)

Reserved

Remote error count

(most significant byte)

Remote error count

(least significant byte)

synchronization detect

(see STo7 channel 8 definition)

STo7 Channel 8 Definition:

Overhead Information

Fiber Interface

Eight of the 256 fiber channels are reserved for

overhead information. These are fiber channels:

B7

B6

B5, B4, B3

B2, B1, B0

remote receiver is in frame synch

when logic 1

Local receiver is in frame synch

when logic 1

Reserved

Reserved

Channel #

0

8

16

24

32

40

48

56

Function

Frame Alignment

Asynchronous signal transfer and

synchronization detect

Checksum of previous frame

Reserved

Reserved

Reserved

Remote error count most significant byte

Remote error count least significant byte

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

STo6A Data from STi6A Chan 0

STo6B Data from STi6B Chan 1

Chan 1 Chan 2 Chan 3 Chan 4 Chan 5

.....

Chan 0 Chan 2 Chan 2 Chan 4 Chan 4

.....

Chan 1 Chan 3 Chan 3 Chan 5 Chan 5

.....

Table 2 - ST6MUX Channel Assignment

Chan 28 Chan 29 Chan 30 Chan 31

Chan 28 Chan 28 Chan 30 Chan 30

Chan 29 Chan 29 Chan 31 Chan 31

5-10

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