MT9079AC datasheet(41/54 Pages) MITEL

41 / 54 page

MT9079

4-277

The TE control bit sets the state of the transmit

E-bits when the receive side has lost CRC-4

synchronization. In this case if the interface is the

Terminal Equipment (TE) side, then the E-bits must

be zero. If the interface is the Network Termination

(NT) side, the transmit E-bits must be one when

CRC-4

synchronization

lost.

When CRC-4

synchronization is achieved the transmit E-bits will

function according to ITU-T G.704.

The MT9079 has a suite of 30 maskable interrupts.

At this point in the initialization procedure the SYNI,

RAII, AISI, AIS16I, LOSI, FERI, BPVO and SLPI

interrupts will be unmasked and all others will be

masked.

the

application

does

not

require

interrupts, the SPND control bit should be kept at

one.

Adjusting the ST-BUS offset will move the bit

positions of the ST-BUS output streams with respect

to the input frame pulse F0i. This can be used to

compensate for large delays in very long backplane

applications.

It can also be used to minimize the

delay through the receive elastic buffer.

Selection of the PCM 30 encoding will be determined

by the line interface arrangement used. The default

is HDB3 encoding on bipolar non-return to zero

signals, which will interface directly to most Line

Interface Units (LIU).

After a power-on reset the state of the error counters

of page 4 will be undetermined. Therefore, each of

the counters appropriate to the application should be

cleared by writing a zero value to the counter

Figure 12 - MT9079 Initialization Procedure

START

TAIS input = low

Power-on Reset - RESET

input = RC > = 5 x power

supply rise time

Write 00H to all control

SPND bit = 1

registers of pages 7 & 8

Select mode of operation.

Note 1.

Select National bit, data

link, and AIS mode of

operation. Note 1.

8KSEL bit = 1 if using the

E8Ko output for loop

(slave) timing. Note 1.

is Interface

TE?

Mask and unmask

interrupts. Note 1.

Select ST-BUS offset.

Note 1.

Select PCM 30 line

encoding. Note 1.

Clear the error counters

of page 4. Note 2.

Read interrupt vector

SPND = 0.

Note 3.

TAIS input = high

STOP

YES

TE bit = 1

Notes:

1. Skip if default option is required.

2. Skip if counters are not used.

3. Skip if interrupts are not used.

MT9079AC Datasheet(PDF) 41 Page - Mitel Networks Corporation

MT9079AC Datasheet(HTML) 41 Page - Mitel Networks Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54

Datasheet Download

Link URL