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MT9122AE

Dual Voice Echo Canceller with Tone Detection

Mitel Networks 

MT9122

Preliminary Information

Pin Description (continued)

Pin #

17/18

Name

S4/S3

Description

Selection of Echo Canceller B Functional States (Input):

Controllerless Mode: Selects Echo Canceller B functional states according to Table 2.

Controller Mode: S4 and S3 pins become SCLK and CS pins respectively.

17 SCLK Serial Port Synchronous Clock (Input): Data clock for the serial microport interface.

18

19/20

CS

S2/S1

Chip Select (Input): Enables serial microport interface data transfers. Active low.

Selection of Echo Canceller A Functional States (Input):

Controllerless Mode: Selects Echo Canceller A functional states according to Table 2.

Controller Mode: S2 and S1 pins become DATA2 and DATA1 pins respectively.

19 DATA2 Serial Data Receive (Input):

In Motorola/National serial microport operation, the DATA2 pin is used for receiving data. In

Intel serial microport operation, the DATA2 pin is not used and must be tied to Vss or Vdd.

20 DATA1 Serial Data Port (Bidirectional):

In Motorola/National serial microport operation, the DATA1 pin is used for transmitting data. In

Intel serial microport operation, the DATA1 pin is used for transmitting and receiving data.

21

F0od Delayed Frame Pulse Output (Output):

In ST-BUS operation, this pin generates a delayed frame pulse after the 4th channel time slot

and is used for daisy-chaining multiple ST-BUS devices. See Figures 5 to 8.

In SSI operation, this pin outputs logic low.

22

VDD Positive Power Supply: Nominally 5 volts.

23

Sout Send PCM Signal Output (Output):

128 kbit/s to 4096 kbit/s serial PCM output stream. Data may be in either companded or 2’s

complement linear PCM format. Two PCM channels are time-multiplexed on this pin. These

are the Send Out signals after echo cancellation and Non-linear processing. Data bits are

clocked out following SSI or ST-BUS timing requirements.

24

Rout Receive PCM Signal Output (Output):

128 kbit/s to 4096 kbit/s serial PCM output stream. Data may be in either companded or 2’s

complement linear PCM format. Two PCM channels are time-multiplexed on this pin. This

output pin is provided for convenience in some applications and may not always be required.

Data bits are clocked out following SSI or ST-BUS timing requirements.

25

F0i Frame Pulse (input):

In ST-BUS operation, this is a frame alignment low going pulse. SSI operation is enabled by

connecting this pin to Vss.

26 BCLK/C4i Bit Clock/ST-BUS Clock (Input):

In SSI operation, BCLK pin is a 128 kHz to 4.096 MHz bit clock. This clock must be

synchronous with ENA1, ENA2, ENB1 and ENB2 enable strobes.

In ST-BUS operation, C4i pin must be connected to the 4.096MHz (C4) system clock.

27/28 CONFIG1/ Device Configuration Pins (Inputs).

CONFIG2 When CONFIG1 and CONFIG2 pins are both logic 0, the MT9122 serial microport is enabled.

This configuration is defined as Controller Mode. When CONFIG1 and CONFIG2 pins are in

any other logic combination, the MT9122 is configured in Controllerless Mode. See Table 3.

Notes:

1. All unused inputs should be connected to logic low or high unless otherwise stated. All outputs should be left open circuit when not used.

2. All inputs have TTL compatible logic levels except for MCLK, Sin and Rin pins which have CMOS compatible logic levels and PWRDN

pin which has Schmitt trigger compatible logic levels.

3. All outputs are CMOS pins with CMOS logic levels.

8-20

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