MT9075B datasheet(15/78 Pages) MITEL

15 / 78 page

Preliminary Information

MT9075B

used to control the transmit channel associated

signalling. The DSTi and DSTo streams contain the

transmit and receive voice and digital data.

Identification Code

The MT9075B shall be identiﬁed by the code

10101010, read from the identiﬁcation code status

Reset Operation (Initialization)

The MT9075B can be reset using the hardware

RESET pin (pin 11 in PLCC, pin 84 in MQFP, see pin

description for external reset circuit requirements) or

the software reset bit RST (page 01H, address 11H).

When the device emerges from its reset state it will

begin to function with the default settings described

in Table 6. A reset operation takes 1 full frame (125

us) to complete.

Table 6 - Reset Status

Transmit AIS Operation

The pin TAIS (Transmit AIS, pin 60 in PLCC, pin 48 in

MQFP) allows an all ones signal to be transmitted

from the point of power-up without the need to write

any control registers. During this time the IRQ pin is

tristated. After the interface has been initialized

normal operation can take place by making TAIS

high.

National Bit Buffers

Table 7 shows the contents of the transmit and

receive Frame Alignment Signals (FAS) and Non-

frame Alignment Signals (NFAS) of time slot zero of

a PCM 30 signal. Even numbered frames (CRC

Frame # 0, 2, 4,...) are FASs and odd numbered

frames (CRC Frame # 1, 3, 5,...) are NFASs. The bits

of each channel are numbered 1 to 8, with bit 1 being

the most signiﬁcant and bit 8 the least signiﬁcant.

Table 7 - FAS and NFAS Structure

Table 8 illustrates the organization of the MT9075B

transmit and receive national bit buffers. Each row is

an addressable byte of the MT9075B national bit

buffer, and each column contains the national bits of

an odd numbered frame of each CRC-4 Multiframe.

The transmit and receive national bit buffers are

located at page 0DH and 0EH respectively.

Function

Status

Mode

Termination

Loopbacks

Deactivated

Transmit FAS

Cn0011011

Transmit non-FAS

1/Sn1111111

Transmit MFAS (CAS)

00001111

Data Link

Deactivated

CRC Interworking

Activated

Signalling

CAS Registers

ABCD Bit Debounce

Deactivated

Interrupts

Interrupt Mask Word

Zero unmasked, all

others masked;

interrupts not suspended

RxMF Output

Signalling Multiframe

Error Insertion

Deactivated

HDLCs

Deactivated

Counters

Cleared

Tx Message Buffer

All locations set to 54H

Per Time Slot Control

Buffer

All locations cleared

CRC

Frame/

Type

PCM 30 Channel Zero

5678

0/FAS

11011

1/NFAS

01A

Sa4 Sa5 Sa6 Sa7 Sa8

2/FAS

11011

3/NFAS

01A

Sa4 Sa5 Sa6 Sa7 Sa8

4/FAS

11011

5/NFAS

11A

Sa4 Sa5 Sa6 Sa7 Sa8

6/FAS

11011

7/NFAS

01A

Sa4 Sa5 Sa6 Sa7 Sa8

8/FAS

11011

9/NFAS

11A

Sa4 Sa5 Sa6 Sa7 Sa8

10/FAS

11011

11/NFAS

11A

Sa4 Sa5 Sa6 Sa7 Sa8

12/FAS

11011

13/NFAS

Sa4 Sa5 Sa6 Sa7 Sa8

14/FAS

11011

15/NFAS

Sa4 Sa5 Sa6 Sa7 Sa8

indicates position of CRC-4 multiframe alignment signa

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