MT8924AS datasheet(6/14 Pages) MITEL

6 / 14 page

MT8924

Preliminary Information

8-8

control byte. The data byte contains the number of

the channel to be disconnected. The second byte

contains the opcode (D0-D3). One frame pulse

must

pass

between

disconnection

and

reconnection of the same channel.

Instruction 4 : Overflow Status Monitoring

This function extracts overflow status information

on all existing conferences and transfers it to the

microprocessor data bus. This instruction consists

of two control bytes which are differentiated by the

C/D control signal. C/D set Low reads the status of

the first eight conferences, while C/D set High

reads the status of the remaining two conferences.

conference

overflow

when

the

corresponding status bit is high.

Instruction 5 : PCM Mode Select

This function is used to set the PCM format. The

control byte from the microprocessor consists of

one data byte. It contains the Extra Bit E (D6), the

Format Bits F1-F0 (D5, D4), and the opcode (D0-

D3). The E bit must be high when the PCM frame

contains an extra bit (i.e. 1.544 Mb/s). Normally E

is Low. Bits F1-F0 are used to select the PCM byte

format, according to Table 2. After RESET the

default values correspond to F1 at Low and F0 at

High if A-Law is selected, and F1 at High and F0 at

High if

µ-Law is selected. All channels must be

disconnected

when

the

PCM

mode

select

instruction is sent. They must remain disconnected

for at least two frame pulses after the instruction is

sent. It is recommended that this instruction be

used immediately following a system reset (see

RESET pin description).

Instruction 6 : Status Monitoring

This function is a read operation which consists of

a data byte, a control byte, and a status byte. It

extracts

information

for

test

and

diagnostic

purposes and transfers it to the microprocessor

bus. The first byte contains the channel number,

while the second byte contains the opcode (D0-

D3). The third byte contains the status information

about the operating mode of the channel (D4-D7);

the

attenuation

level (D2-D3); and

the

noise

suppression level (D0-D1).

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