MT8982 Просмотр технического описания (PDF) - Mitel Networks

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MT8982

ISO-CMOS ST-BUS™ FAMILY Small Digital Switch (MiniDX)

Mitel Networks 

MT8982 ISO-CMOS

Channel 31

Channel 0

F0i

C4

Microport

Mode

Bit 0

Wr DM

Link 0

Ch 31

Bit 1

Wr DM

Link 1

Ch 31

Bit 2

µP

Bit 3

Rd CM

Link 0

Ch 1

Bit 4

Rd DM

Link 0

Ch 1

Bit 5

Rd CM

Link 1

Ch 1

Bit 6

µP

Bit 7

Rd DM

Link 1

Ch 1

Serial Port Mode

Wr CM

Link 0

Ch 31

Wr CM

Link 1

Ch 31

Figure 4 - Internal Memory Access Windows

channels and is not dependent on the input and

output streams. The delays are given in Table 3.

The maximum delay is one frame plus one channel;

the minimum delay is two channels.

Device Programming

Microport Mode

Input

Channel

Output

Channel

Delay

n

m = n, n+1 m- n + 32 channels

n

m > n+1

m- n channels

n

m<n

32- (n-m) channels

Table 3. Input Channel to Output Channel Delay

Times

The following delays apply to writing data to the

Connect Memory in message mode. For stream 0,

data must be written to a Connect Memory location

at least one timeslot before the corresponding output

channel or the output data will be delayed by one

frame. For stream 1, data must be written at least

two timeslots before the output channel or the output

data will be delayed by one frame.

In serial microport mode, the MT8982 is

programmed and read using microcycles which

consist of a command/address byte followed by a

data byte.

The Command/Address Byte is shown in Table 1.

Bits 0 and 1 are the command bits (Cmd0-1), and

are used to indicate the type of microcycle access.

The microcontroller can read the Data Memory, read

or write the Connect Memory, and set per-channel

message or connection mode. Bits 2 to 6 of the

command/address byte (Ch0-Ch4) correlate to a

channel on a TDM stream (0-31). Bit 7 (STREAM)

correlates to stream 0 or stream 1. These bits

address the corresponding Data Memory or Connect

Memory location.

The microcycle operations selected by the

command/address byte are as follows:

Read Connect Memory (Cmd0-1: 0,0)

Bits 0 to 7 of the addressed Connect Memory

location will be transmitted to the microcontroller

in the following data byte. Depending on what

the last Connect Memory write mode was, the

data transmitted could be a message byte or a

Connection Mode data byte.

2-36

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