TrueSpeech® Co-Processor
PRELIMINARY/CONFIDENTIAL
Version: 1.18
9.4
Idle
Command:
Status:
0000H
0000H
The Idle command instructs the CT8022 to enter IDLE mode. If the CT8022 is in Record, Playback, Full Duplex, or
Speakerphone modes, speech processing is stopped. In IDLE mode, the CT8022 performs no processing except to
wait for a command from the Host.
Idle should be the first command written to the CT8022 following reset.
9.5
Codec Configuration
9.5.1
CODEC Configuration Command
The CT8022 supports connection to two external G.711 A-law, µ-law or 16-bit linear CODECs, labeled CODEC0
and CODEC1. When two CODECs are used, both CODECs must be of the same type. CODEC 1 is normally
required for DSVD operation (record/playback). CODEC 0 is optional, and is required only for standalone
Speakerphone mode. The data source for the record channel can be selected to be either CODEC. The data output
for the playback channel can be selected to go to either CODEC, or both CODECs simultaneously.
Note: After Reset, the Host must program the CODEC configuration before attempting any other
operations (with the exception of Host-to-Host compression/decompression). Certain CODECs may
impose additional restrictions on the choice of the CT8022’s external crystal or clock source
frequency.
Command C1 (= C4XXH or C5XXH):
1100
010
Width
(8)
Law
(7)
Master
(6)
Long
(5)
OUTPUT CODEC
(4-3)
INPUT CODEC
(2)
Set Rate
(1)
0
0
(15-12) (11-9)
Status S1:
1100
010
Width
(8)
Law
(7)
Master
(6)
Long
(5)
OUTPUT CODEC
(4-3)
INPUT CODEC
(2)
Set Rate
(1)
0
0
(15-12) (11-9)
Command C2 (only if Set Rate = 1, not required for slave mode operation):
WIDE
(15)
FSYNC_RATE
(14-5)
CO_RATE
(4-0)
Status S2 (only if Set Rate = 1):
WIDE
(15)
FSYNC_RATE
(14-5)
CO_RATE
(4-0)
52
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 ]
