MT9075AP datasheet(30/78 Pages) MITEL

30 / 78 page

MT9075A

Preliminary Information

4-158

Table 13 - Multiframe National Bit Buffer and DL

Selection Word (Page 01H, Address 10H)

Bit

Name

Functional Description

ASEL

AIS Select. This bit selects the

criteria on which the detection of a

valid Alarm Indication Signal (AIS)

is based. If zero, the criteria is less

than three zeros in a two frame

period (512 bits). If one, the criteria

is less than three zeros in each of

two

consecutive

double-frame

periods (512 bits per double-frame).

MFSEL

Multiframe

Select.

This

bit

determines

which

receive

multiframe

signal

(CRC-4

signalling) the RxMF (pin 42 in

PLCC, 23 in MQFP) signal is

aligned with. If zero, RxMF is

aligned with the receive signalling

multiframe. If one, RxMF is aligned

with the receive CRC-4 multiframe.

NBTB

National Bit Transmit Buffer. If

one,

the

transmit

NFAS

signal

originates from the transmit national

bit buffer; if zero, the transmit NFAS

signal originates from the TNU4-8

bits of page 01H, address 12H.

4 - 0 Sa4 - Sa8 A one selects the corresponding Sa

bits of the NFA signal for 4, 8, 12,

kbits/sec.

data

link

channel. Data link (DL) selection will

function in termination mode only; in

transmit transparent mode Sa4 is

automatically

selected

see

TxTRSP control bit of page 01H,

address

11H.

zero,

the

corresponding bits of transmit non-

frame

alignment

signal

are

programmed

the

Non-Frame

Alignment

Control

Word

(page

01H, address 12H).

Bit

Name

Functional Description

TIU0

Transmit International Use Zero.

When CRC-4 operation is disabled

(CSYN=1), this bit is transmit on

the PCM 30 2048 kbit/sec. link in

bit position one of time-slot zero of

frame-alignment

frames.

reserved for international use and

should normally be kept at one. If

CRC

processing

used,

i.e.,

CSYN =0, this bit is ignored.

CRCM

CRC-4

Modification.

one,

activates the CRC-4 remainder

modification

function

when

the

device is in transparent mode. The

received

CRC-4

remainder

modified to reflect only the changes

in the transmit DL. If zero, time slot

zero data from DSTi will not be

modified in transparent mode.

RST

Reset. When this bit is changed

from zero to one the device will

reset to its default mode. See the

Reset Operation section for the

default settings.

---

Unused.

Set

high

for

normal

operation.

AUTY

Automatic

Y-Bit

Operation.

zero, the Y-bit of the transmit

multiframe alignment signal will

report the multiframe alignment

status to the far end i.e., zero -

multiframe alignment acquired, one

- lost. If one, the Y-bit is under the

manual control of the Transmit

Multiframe

Alignment

Control

Word.

TxTRSP

Transmit Transparent Mode. If

one, the MT9075A is in transmit

transparent mode. No framing or

signaling is imposed on the data

transmit from DSTi onto the line. If

zero, it is in termination mode.

Table 14 - Mode Selection Control Word

(Page 01H, Address 11H)

MT9075AP Datasheet(PDF) 30 Page - Mitel Networks Corporation

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