MT9079AC datasheet(5/54 Pages) MITEL

5 / 54 page

MT9079

4-241

Notes:

1. All inputs are CMOS with TTL compatible logic levels.

2. All outputs are CMOS and are compatible with both TTL and CMOS logic levels.

3. See AC Electrical Characteristics - Timing Parameter Measurement Voltage Levels for input and output

voltage thresholds.

RxMF

Receive Multiframe Boundary (Output): An output pulse delimiting the received

multiframe boundary. The next frame output on the data stream (DSTo) is basic frame

zero on the PCM 30 link. This receive multiframe signal can be related to either the

receive CRC multiframe (MFSEL=1) or the receive signalling multiframe (MFSEL=0).

See Figures 25 and 26.

TxMF

Transmit Multiframe Boundary (Input): This input is used to set the channel

associated and CRC transmit multiframe boundary. The device will generate its own

multiframe if this pin is held high. This input is pulled high in most applications. See

Figures 24 to 26.

S/P

Serial/Parallel (Input): High - serial controller port or ST-BUS operation.

Low - parallel processor port operation.

VSS

Negative Power Supply (Input): Ground.

CSTi2

Control ST-BUS Input Two (Input): A 2.048 Mbit/s ST-BUS control stream which

contains the 30 (ABCDXXXX) transmit signalling nibbles when RPSIG=0.

When

RPSIG=1 this pin has no function. Only the most significant nibbles of each ST-BUS

timeslot are valid. See Figure 4c.

-39

No Connection.

CSTo1 Control ST-BUS Output One (Output): A 2.048 Mbit/s serial status stream which

provides the 30 (ABCDXXXX) receive signalling nibbles.

TAIS

Transmit Alarm Indication Signal (Input): High - TxA and TxB will transmit data

normally. Low - TxA and TxB transmits an AIS (all ones signal).

TxB

Transmit B (Output): A split phase unipolar signal suitable for use with TxA, an

external line driver and a transformer to construct a bipolar PCM 30 line signal. This

output can also transmit RZ and NRZ bipolar signals. See Figures 28 and 30.

TxA

Transmit A (Output):A split phase unipolar signal suitable for use with TxB, an

external line driver and a transformer to construct a bipolar PCM 30 line signal. This

output can also transmit RZ and NRZ bipolar signals. See Figures 28 and 30.

Internal Connection (Input): Connect to ground for normal operation.

Pin Description (Continued)

Pin #

Name

Description (see notes 1, 2 and 3)

DIP

PLCC

QFP

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