Digital Voice Systems AMBE-3000 Specifications download pdf (Page 55)

AMBE-3000™ Vocoder Chip Users Manual

Version 2.8, August, 2011

O Management

0,800 Hz. 1 0 0

921,600 Hz. 1 0 1

Table 24 McBSP Clock Rates

The McBSP port operates at clock rates from 28,800 up to 921,600 Hz. Note that this specifies the rate at which the packet

will be transmitted. The receive clock and frame signals must generated by the device being interfaced to the AMBE-3000™

Vocoder Chip. The receive clock supplied to the AMBE-3000™ Vocoder Chip must be between 28,000 Hz. and 921,600 Hz.

See Table 24 McBSP Clock Rates for available rates and configuration.

5.5 Parallel Interface

Pin # Description Direction Description

TQFP BGA

33 N2 PPT_DATA0 I/O

34 P2 PPT_DATA1 I/O

35 N3 PPT_DATA2 I/O

36 P3 PPT_DATA3 I/O

37 L4 PPT_DATA4 I/O

38 M4 PPT_DATA5 I/O

40 K5 PPT_DATA6 I/O

41 N5 PPT_DATA7 I/O

Parallel Port

Transmit/Receive

Data

46 N6 PPT_READ Input

PPT Read Request

(Active Low)

47 L6 PPT_WRITE Input

PPT Write Request

(Active Low)

48 K7 PPT_ACK Output PPT Transfer Acknowledge

Table 25 Parallel (PPT) Interface Pins

5.5.1 Parallel Port Packet Interface

The parallel interface runs asynchronously and allows all packet data transfers to be performed on an 8-bit wide bus. The

parallel port interface (PPT) requires 11 pins total. When parallel port is used for the packet interface the UART or the McBSP

serial interface can not be used. The parallel interface is designed for packet data. This means that in codec mode the parallel

interface can be used for channel data only. In packet mode the parallel interface is used for both speech data and channel data

as well as control packets.

The AMBE-3000™ Vocoder Chip will set TX_RDY high when data is available to be read from the parallel port.

The packet data from the AMBE-3000™ Vocoder Chip is read by setting the pin PPT_READ low, then waiting for the

AMBE-3000™ Vocoder Chip to set PPT_ACK low. After PPT_ACK goes low, the 8 data pins are valid, after the pins are

read PPT_READ should be set high. After PPT_READ goes high, the AMBE-3000™ Vocoder Chip will set PPT_ACK high.

To write packet data to the AMBE-3000™ Vocoder Chip first the data is transferred to the 8 data pins and then the

PPT_WRITE pin must be set low. Then the AMBE-3000™ Vocoder Chip reads the data from the pins and sets PPT_ACK

(Subject to Change) Page 45

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