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參數(shù)資料
| 型號(hào)： | AMBE2000 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | VOCODER CHIP |
| 中文描述： | 聲碼器芯片 |
| 文件頁數(shù)： | 21/47頁 |
| 文件大小： | 324K |
| 代理商： | AMBE2000 |
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AMBE-2000 Vocoder Chip
User’s Manual Version 3.0
page 21
Visit us at
www.dvsinc.com
Confidential Proprietary, Subject to Change
4.3
Channel Serial Mode
The signals in Table 4-C make up the serial channel interface. The serial channel mode transfers data in and out of the AMBE-
2000 using 16 bit words on the two data lines
CHAN_RX_DATA
and
CHAN_TX_DATA
. The selection of the
formatted
or
unformatted
format of this data is made using information in Table 4-A.
Table 4-C Channel Serial I nterface Pin Descriptions
Pin
Symbol
Pin
Direction
Pin
Number
Description
EPR
Out
20
Encoder Packet Ready
: Following a reset, this output signal will have a
high to low transition to indicate that the encoder has a frame of data to
output. The next packet will be ready approximately 20 msec later.
See
Note 1.
CHAN_ RX _ DATA
In
32
Serial Data I nput
: 16 bits of channel data are input on
CHAN_ RX _ DATA
,
synchronous to
CHAN_ RX _ CLK
, with each
CHAN_ RX _ STRB
pulse.
CHAN_ RX _ CLK
In
28
Serial
CHAN_ RX _ DATA
is latched by the AMBE-2000 on the falling edges of
CHAN_ RX _ CLK
.
I nput
Clock
:
In
coordination
with
CHAN_ RX _ STRB
,
CHAN_ RX _ STRB
In
30
I nput ( W rite) Data Strobe
: This signal indicates to the AMBE-2000
when the data on
CHAN_ RX _ DATA
will be latched by
CHAN_ RX _ CLK
.
See Figure 4-B.
CHAN_ TX _ DATA
Out
42
Serial
CHAN_ TX _ DATA
,
CHAN_ TX _ STRB
pulse.
Data
Output
:
16
bits
of
to
channel
CHAN_ TX _ CLK
,
data
are
output
with
on
synchronous
each
CHAN_ TX _ CLK
In
34
Serial Output Clock
: In coordination with
CHAN_ TX _ STRB
, the data on
CHAN_ TX _ DATA
is output by the AMBE-2000 on the falling edges of
CHAN_ TX _ CLK
.
CHAN_ TX _ STRB
Active
Output/
Passive
Input
38
Output ( Read) Data Strobe
: This signal indicates to the AMBE-2000
when to bring the data to the
CHAN_ TX _ DATA
pin. See Figure 4-B.
Note 1:
The AMBE-2000 expects an encoder packet to be read approximately every 20 msec. Following the initial
reset, wait for EPR to go low and read the initial packet (t0). 20 msec later, the next packet (t1) should be ready.
For packet t1 and all following packets use the procedure below:
1) Wait for slightly less than 20 msec.
2) Assert CHAN_TX_STB and read word on CHAN_TX_DATA.
3) If transmitted word not 0x13EC, discard it and repeat step 2.
4) If transmitted word 0x13EC, read 23 more words (rest of packet).
A new packet should be ready every 20 msec after the initial EPR high to low transition. A packet read should take place
every 20 msec. If there is a delay in the read (i.e. a packet is missed), it is recommended that the device be reset.
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