TrueSpeech® Co-Processor
PRELIMINARY/CONFIDENTIAL
Version: 1.18
GET TONE STATE
Command: 6E03H
If tone generation is still in progress then:
Status: 0001H
Otherwise:
Status:
0000H
9.19.4
Tone Generation in Asynchronous Mode
To generate a tone On = 90ms followed by a tone Off = 90ms use the following sequence:
1. Write Set Asynchronous Tone mode command.
2. Wait for Status Ready in Hardware Status Register and read status response (this needs to be done only once).
3. Write Set Tone On Period command
4. Wait for Status Ready and read status response.
5. Write tone On period value command = 0168H (0168H = 360 decimal, 360 * 250 us = 90ms)
6. Wait for Status Ready and read status response.
7. Write Set Tone Off Period command
8. Wait for Status Ready and read status response.
9. Write tone Off period value command = 0168H
10. Wait for Status Ready and read status response (this needs to be done only once, unless the On/Off period
requires further change).
11. Write tone command 60XXH
12. Wait for Status Ready and read response
13. Poll device using Get Tone State command
14. Wait for Status Ready and check status reply to determine if tone has completed yet (repeat this last step as often
as required).
Once tone generation has been completed, the Host should issue the Idle command.
9.19.5
Tone Level Table
Level Value (Index)
CODEC Output
Level (dB Relative
to 0.707 VRMs)
Digital Output
Level dBm0
0
1
2
+6
+4
+2
0
+1.5
-0.5
-2.5
3
-4.5
4
-2
-6.5
5
-4
-8.5
6
7
8
9
10
11
12
13
14
15
-6
-8
-10.5
-12.5
-14.5
-16.5
-18.5
-20.5
-22.5
-24.5
-26.5
-28.5
-10
-12
-14
-16
-18
-20
-22
-24
126
DSP GROUP, INC., 3120 SCOTT BOULEVARD CT8022A11AQC FW Revision 0118
SANTA CLARA, CA 95054 PH: 408 986 – 4300 FAX: 408 986 – 4490
All specifications are subject to change without prior notice.
ETC [ ETC ]
