MT9079AC datasheet(4/54 Pages) MITEL

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MT9079

4-240

R/W

[P]

RxD

[S]

CSTi0

[ST]

Read/Write (Input): High - the parallel processor is reading data from the MT9079.

Low - the parallel processor is writing data to the MT9079.

Receive Data (Input): This pin function is used in Motorola and National Microwire

serial controller mode. Data is sampled on the rising edge of SCLK, MSB first. See

CS pin description.

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

the device control, mode selection, and performance monitoring control.

[SP]

Chip Select (Input): Low - selects the MT9079 parallel processor or serial controller

interface. High - the parallel processor or serial controller interface is idle and all

bus I/O pins will be in a high impedance state. When controller mode is selected,

the SCLK input is sampled when CS is brought low. If SCLK is high the device in is

Intel mode; if SCLK is low it will be in Motorola/National Microwire mode. This pin

has no function (NC) in ST-BUS mode.

[P]

SCLK

[S]

CSTi1

[ST]

Data Strobe (Input): This input is the active low data strobe of the parallel

processor interface.

Serial Clock (Input): This is used in serial controller mode to clock serial data in

and out of the MT9079 on RxD and SIO. If SCLK is high when CS goes low, the

device will be in Intel mode; if SCLK is low when CS goes low, it will be in

Motorola/National Microwire mode.

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

the per timeslot control programming.

C4i/C2i 4.096 MHz and 2.048 MHz System Clock (Input): This is master clock for the serial

PCM data and ST-BUS sections of the MT9079. The MT9079 automatically detects

whether a 4.096 or 2.048 MHz clock is being used. See Figure 22 for timing

information.

E2i

2.048 MHz Extracted Clock (Input): This clock is extracted from the received

signal. Its rising edge is used internally to clock in data received on RxA and RxB.

See Figure 29.

-28

No Connection.

RxB

Receive B (Input): Received split phase unipolar signal decoded from a bipolar line

receiver. Receives RZ and NRZ bipolar signals. See Figures 29 and 31.

RxA

Receive A (Input): Received split phase unipolar signal decoded from a bipolar line

receiver. Receives RZ and NRZ bipolar signals. See Figurs 29 and 31.

F0i

Frame Pulse (Input): This is the ST-BUS frame synchronization signal which

delimits the 32 channel frame of all ST-BUS streams, as well as DSTi and DSTo in

all modes.

E8Ko

Extracted 8 kHz Clock (Output): An 8 kHz signal generated by dividing the

extracted 2.048 MHz clock (E2i) by 256 and aligning it with the received PCM 30

frame. The 8 kHz signal can be used to synchronize the system clock with the

extracted 2.048 MHz clock. E8Ko is high when 8KSEL=0. See Figure 27.

DSTi

Data ST-BUS (Input). A 2.048 Mbit/s serial stream which contains the 30 PCM or

data channels to be transmitted on the PCM 30 line. See Figure 4a.

Pin Description (Continued)

Pin #

Name

Description (see notes 1, 2 and 3)

DIP

PLCC

QFP

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