Digital Voice Systems AMBE-3000 Specifications download pdf (Page 52)

AMBE-3000™ Vocoder Chip Users Manual

Version 2.8, August, 2011

O Management

0,800 1 0 0

Table 20 UART Baud Rates

5.4 McBSP Interface

The Multichannel Buffered Serial Port (McBSP) is a synchronous serial communication port. The beginning of a word of data

is indicated by a frame signal. The receive frame signal and receive clock are inputs and must be generated by the device

interfacing to the AMBE-3000™ Vocoder Chip. The McBSP interface can be used as either the codec interface or the packet

interface. When the McBSP interface is used as the codec interface for speech data it is not available for packet data. When

operating as the packet interface the McBSP interface is used for packet data.

Pin Pin Name Direction Description

TQFP BGA

18 G2 McBSP_RxD Input Serial Receive Data

19 G1 McBSP_TxD Output Serial Transmit Data

21 H2 McBSP_CLKR Input Serial Receive Clock

22 H4 McBSP_FSX I/O Serial Transmit Frame

23 J1 McBSP_CLKX I/O Serial Transmit Clock

24 J2 McBSP_FSR Input Serial Receive Frame

Table 21 McBSP Interface Pins

5.4.1 McBSP Selected for Codec Interface

If the McBSP is selected as the codec interface and companding is selected there are 8 data bits (In Figure 23 N=8). If

companding is not used then there are 16 data bits (In Figure 23 N=16). The bits are order from N-1

to 0, where bit N-1 is the

MSB and bit 0 is the LSB. McBSP_RxD is sampled on the rising edge of McBSP_CLKR and McBSP_TxD is sampled on the

falling edge of McBSP_CLKR. The signals McBSP_CLKX, McBSP_CLKR, McBSP_FSX and McBSP_FSR are all inputs

generated by the codec. McBSP_CLKX and McBSP_CLKR should be connected together. McBSP_FSX and McBSP_FSR

should also be connected together.

Note: The higher the frequency of the MCBSP clock the more power consumption is reduced when low-power mode is

enabled.

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Digital Voice Systems AMBE-3000 Specifications Page 52