MT8982AC datasheet(6/14 Pages) MITEL

6 / 14 page

MT8982 ISO-CMOS

2-36

Figure 4 - Internal Memory Access Windows

Channel 31

Channel 0

F0i

Microport

Mode

Serial Port Mode

Wr DM

Link 0

Ch 31

Bit 0

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Wr DM

Link 1

Ch 31

Wr CM

Link 0

Ch 31

Rd DM

Link 1

Ch 1

Rd CM

Link 1

Ch 1

Rd DM

Link 0

Ch 1

Rd CM

Link 0

Ch 1

Wr CM

Link 1

Ch 31

µP

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.

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.

Device Programming

Microport Mode

serial

microport

mode,

the

MT8982

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

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.

Input

Channel

Output

Channel

Delay

m = n, n+1

m- n + 32 channels

m > n+1

m- n channels

m < n

32- (n-m) channels

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