TrueSpeech® Co-Processor
PRELIMINARY/CONFIDENTIAL
Version: 1.18
9.8
Playback
Command (C1 = 2CXXH):
0010
11
000
PLAYMODE
(6-4)
00
TFR Mode
(1-0)
(15-12)
(11-10)
(9-7)
(3-2)
Status (S1):
0010
11
000
PLAYMODE
(6-4)
00
TFR Mode
(1-0)
(15-12)
(11-10)
(9-7)
(3-2)
9.8.1
Transfer Mode
The TFR Mode field is used to select the mode of data transfer:
TFR Mode
Data Transfer Mode
00
Data Transfer via Software Command and Status Registers (CT8015/CT8005 protocol
mode). Refer to Section 6 (Host Data Transfer Modes) and Section 9.7.4 (Record
Protocol).
01
Equivalent to TFR Mode 11, with the addition of strict maintenance of data frame
alignment. Refer to Section 9.8.4 (Playback Frame Alignment Using Transmit Data
Buffer) for more details. Not available in some older versions of the CT8020.
10
11
Reserved
Data Transfer via Host Transmit Data Buffer Access Port. Poll Sync Mode should be
selected when using this data transfer option. This data transfer mode must be
selected if performing DMA transfers using the TXDREQ and TXDACKN signals. Refer
to Section 6 (Host Data Transfer Modes) and Section 9.7.4 (Record Protocol).
For new designs using TFR Mode = [binary] 11 or 01 is recommended.
The C2-S2, C3-S3 commands detailed below are used once at the beginning of playback (or Host-to-Host
decompression) if TFR Mode = [binary] 11 or 01. If TFR Mode = 00, the C2-S2, C3-S3 commands are used to
transfer playback speech data via the Software Control and Status Register.
The Data Transfer command is required only if TFR Mode = 00 (CT8015/CT8005 protocol mode). This command
is used only if transferring speech data via the Software Control and Status Registers.
Refer to Section 9.8.3 (Playback Protocol).
70
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 ]
