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Digital Voice Systems AMBE-3000 Spezifikationen Seite 62

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AMBE-3000F™ Vocoder Chip Users Manual
Version 3.4, April, 2014
I/
O Management
To
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
t
a
t
a
<= 5 µs (1.12 µs typical)
t
b
System Dependent
t
c
< 320 ns
t
d
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
a
+ t
b
+ t
c
all determines what the maximum rate is. The lower t
b
is the faster the transfer rate. The transfer rate is as
follows:
Transfer Rate (bits/sec) = 8 / (t
a
+ t
b
+ t
c
)
(Subject to Change) Page 52
DVSI CONFIDENTIAL PROPRIETARY
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