Digital Voice Systems AMBE-3000 Especificações descarregar pdf (Página 62)

AMBE-3000F™ Vocoder Chip Users Manual

Version 3.4, April, 2014

O Management

write packet data to the AMBE-3000F™ 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-3000F™ Vocoder Chip reads the data from the pins and sets PPT_ACK

low. After the AMBE-3000F™ Vocoder Chip sets PPT_ACK low, PPT_WRITE pin must set high, at which time, the AMBE-

3000F™ Vocoder Chip will set PPT_ACK high.

Figure 34 PPT Interface Timing

PPT Timing

<= 5 µs (1.12 µs typical)

System Dependent

< 320 ns

850 ns min.

Table 26 PPT Timing

The time between when the AMBE-3000F™ Vocoder Chip sets PPT_ACK Low and the user sets PPT_WRITE high has to be

>0. Times t

+ t

all determines what the maximum rate is. The lower t

is the faster the transfer rate. The transfer rate is as

follows:

Transfer Rate (bits/sec) = 8 / (t

+ t

)

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Digital Voice Systems AMBE-3000 Especificações Página 62