Digital Voice Systems AMBE-3000 Specifications download pdf (Page 51)

AMBE-3000™ Vocoder Chip Users Manual

Version 2.8, August, 2011

O Management

The

AMBE-3000™ Vocoder Chip can generate the signal SPI_GENSTE from signals SPI_FSn and SPI_CLK_IN. See Figure

Timing of SPI_GENSTE for the timing relationship between these signals.

Figure 22 Timing of SPI_GENSTE

5.3 UART Interface

The serial interface supports asynchronous communication of real-time compressed voice data to other asynchronous

peripherals that use the standard non-return-to-zero (NRZ) format. The UART interface is designed for packet data only. If

the UART interface is used when running in codec mode the interface provides only channel data. If the UART interface is

used when running in packet mode the UART provides both speech data and channel data.

When UART interface is used for the packet interface neither the McBSP nor the parallel interface can be used.

TQFP BGA

Pin Name Direction Description

111 C7 UART_TX Output UART Transmit Data

112 A7 UART_RX Input UART Receive Data

Table 19 UART Interface Pins

The AMBE-3000™ Vocoder Chip transmits packets using pin UART_TX and receives packets using pin UART _RX. Each

serial word transmitted or received uses 8 data bits, no parity bits, and one stop bit. The serial port operates at baud rates from

28800 up to 460,800 baud. See Table 20 UART Baud Rates for available rates and configuration.

Baud Rate

(baud)

S_COM_RATE2

TQFP Pin 91

BGA Pin F10

S_COM_RATE1

TQFP Pin 90

BGA Pin E11

S_COM_RATE0

TQFP Pin 89

BGA Pin E13

28,800 0 0 0

57,600 0 0 1

115,200 0 1 0

230,400 0 1 1

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Digital Voice Systems AMBE-3000 Specifications Page 51