mt8982as Mitel, mt8982as Datasheet - Page 6

• Manufacturer Part Number: mt8982as
• Description: Iso-cmos St-bus Family Small Digital Switch Minidx
• Manufacturer: Mitel

MT8982
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.
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.
2-36
Table 3. Input Channel to Output Channel Delay
Channel
F0i
C4
Microport
Mode
Serial Port Mode
Input
n
n
n
Channel 31
m = n, n+1
Channel
m > n+1
Output
ISO-CMOS
m < n
Wr DM
Link 0
Ch 31
Bit 0
Times
Figure 4 - Internal Memory Access Windows
m- n + 32 channels
32- (n-m) channels
Wr DM
Link 1
Ch 31
m- n channels
Bit 1
Delay
Wr CM
Link 0
Ch 31
Bit 2
P
Rd CM
Link 0
Ch 1
Bit 3
Channel 0
Device Programming
Microport Mode
In
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.
address the corresponding Data Memory or Connect
Memory location.
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.
serial
microcycle
Rd DM
Link 0
Ch 1
Bit 4
microport
Rd CM
Link 1
Ch 1
Bit 5
operations
mode,
Wr CM
Link 1
Ch 31
Bit 6
P
selected
the
Rd DM
Link 1
Ch 1
Bit 7
MT8982
These bits
by
the
is