AMBE-2000™ Vocoder Chip

User’s Manual Version 3.0

page 20

Confidential Proprietary, Subject to Change

Table 4-A Channel Interface Selection Table

Interface

Select Pins

Port Type

Active Formatted

0

0

Active

Unformatted

0

1

Passive

Formatted

1

0

Passive

Unformatted

1

1

Table 4-B Unformatted Bit per Word Selection Table

Interface

Select Pins

Number

of Voice

Data

Bits per

Word

1

0

0

2

0

1

3

1

0

4

1

1

All transfers occur through a serial port. The serial port inputs and outputs a 16 bit word for every write and read strobe signal

respectively. Serial mode can be formatted or unformatted. Within the unformatted mode, the data is input and output in

16 bits words still but with only 1 to 4 voice data bits carried within each word. These four configurations can be seen in Table

4-B. See section 4.3 for all the details on the serial interface.