D6571E Просмотр технического описания (PDF) - Unspecified
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D6571E Datasheet PDF : 117 Pages
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D6571E Data Sheet
about 0.64 seconds (0.93 seconds for PCM messages)
for 8 KHz sampling rate. For 7.2 KHz sampling rate the
unit is 0.704 seconds (1.03 seconds for PCM recording).
If the offset is “0”, the message will be played from the
beginning. Message playback starts immediately after
receiving the second playback command.
After starting playback, the D6571E monitors
communication port for a HOST command every frame.
The HOST issues additional playback commands during
playback in order to perform line monitoring, change the
speed of the playback, and/or pause playback. Usually,
the HOST will issue an additional playback command
and get back the line status every frame. Playback speed
can be changed at any time while in playback mode by
changing the FLEXI speed in any of the playback
commands. If the PAUSE bit (bit 11) is set to “1”,
playback will stop. The playback will resume from the
same point if the HOST issues the command with “0” in
PAUSE bit. Line monitoring will continue during pause.
If the READ OFFSET bit (bit 10) is high, the D6571E will
return the current offset, i.e., the time elapsed from the
beginning of the message, instead of the line status.
The line status word contains information about the
tones detected from the line and End of Play flag (bit 7),
which indicates whether the end of the current message
has been reached. When this bit is low, the message is
still being played; when it is high, the end of the
message has been reached. The D6571E will continue to
stay in playback mode and monitor the line. If the
requested message number does not exist, the D6571E
will return a status word with the End of Play “1” in
response to the third playback command. If the D6571E
detects a DTMF or CAS tone, the index of this tone will
be reported (bits 0-3, 5) of the status word. See Line
Monitor mode for respective indexes for DTMF tones.
The presence of a Call Progress Tone will be contained
in bit 4. The HOST will monitor these tones every frame
and will act accordingly. Playback will be terminated by
the Idle command and the D6571E will return to Idle
mode. While in Playback mode, the Host may issue
Commands to change independently the DTMF, VOX,
CPT Sensitivity or the Volume Control without
interrupting this mode. The status word will reflect the
status for the Playback mode. Therefore, line
monitoring will not be interrupted.
If the Host sends the command to play binary file, the
D6571E will play silence and return status S3 with BIN
bit and END of Play bit set to “1.” See Data Storage
mode in the Data Transfer Modes section for binary file
storage information.
In case of “cold start” the Playback mode will not be
activated, the D6571E will remain in Idle mode, and
return Idle status.
Read Memory Status
There are two submodes:
1) Get memory status (mode = 00)
In this submode the D6571E returns to the HOST a
status word containing the following information:
Number of recorded messages
Memory full indication
Garbage Collection Recommended
Program ROM status
Voice Prompt status
When 128 messages have been recorded or when there
is no available memory space for recording further
messages, the Memory Full Flag (bit 7) is set. Up to 127
messages are reported in the 7 LSBs of the status word.
When 128 messages are recorded, the Memory Full Flag
is set and the number of messages is “0”.
Note that the message directory may also become full if
a large number of messages are deleted or not saved
without running Garbage Collection.
The Garbage Collection Recommended bit is set to “1”
when the telephone number table has been
reprogrammed, when message(s) have been deleted, the
tail cut function has been performed, or when messages
are too short to be saved. This bit will be reset after
garbage collection is performed.
In order to reduce response time of this command the
calculation of the Voice Prompt checksum can be
disabled if bit VP CHK DIS (bit 7) of the command is set.
After sending the memory status, the D6571E returns
automatically to Idle mode.
In case of “cold start” the D6571E will return the status
with the most significant nibble equal 0. This will be an
indication of the “cold start”. Voice Prompt status and
Program ROM status bits have the same meaning as for
“warm start”. Number of messages, Memory Full, and
Garbage Collection bits are expected to be 0.
2) Get Product Number (mode = 01)
In this submode, the D6571E returns four digits of
product number, i.e., 6571 (0110 0101 0111 0001). The
DS6571E.2
DSP GROUP, INC., 3120 SCOTT BOULEVARD
15
SANTA CLARA, CA 95054 PH: 408 986-4300 FAX: 408 986-4490
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