msm7708-02 Oki Semiconductor, msm7708-02 Datasheet - Page 28

• Manufacturer Part Number: msm7708-02
• Description: Serial Register Interface Adpcm Codec For Telephone Recording
• Manufacturer: Oki Semiconductor

¡ Semiconductor
(6) CR5 (Serial Register Interface Control)
(7) CR6 (VOICE/SILENCE Detect Function Control)
CR5
Initial value
CR6
Initial value
B7: .............. Connection between register and ADPCM
B6: .............. Voice ROM/Serial register selection
B5: .............. Connecting serial register capacity
B4 - B2: ......Reserved for test. Should be set "0"
B1, B0: .......Serial register I/F Instruction command
* (CMD1, CMD0) are reset (0, 0) after command execution.
Instruction commands of Play and REC should not be set when busy (CR5 - B1) and
RPM (CR5 - B0) are "1".
B7: .............. Voice/Silence detect function ON/OFF
B6, B5: .......Transmit side voice/silence detector level settings
B4: .............. Hangover time (refer to Fig. 1) settings
B3: .............. Receive side Voice/Silence detect input signal
B2: .............. Receive side background noise level setting
B1, B0: .......External setting background noise level
ON/OFF
SEND/
VOX
REC
B7
B7
0
0
0: with ADPCM receive side
0: Serial Register
0: 1 Mb (MSM63V89C)
1: 4 Mb (MSM6684), 8 Mb (MSM6685)
(CMD1, CMD0) =
(0,0): –20 dBm0
(1,0): –30 dBm0
0: Internal background noise transmit
When using this data, set the VOXI pin to "0".
0: Internal automatic setting
Internal automatic setting Æ Set to the voice signal level when B3 (VOXI)
changes from "1" to "0".
(0,0): No noise
(1,0): –45 dBm0
ROM/
LVL1
B6
B6
SR
ON
0
0
4M8M/
LVL0
1M
B5
B5
ON
0
0
(0,1): –25 dBm0
(1,1): –35 dBm0
(0,1): –55 dBm0
(1,1): –35 dBm0
(0, 0) :
(0, 1) :
(1, 0) :
(1, 1) :
TIME
OFF
B4
B4
—
0
0
NOP
PLAY (Playback)
REC (Recording)
STOP (Stop)
1: External (by B1, B0) setting
1: ADPCM Transmit side
1: Voice ROM
VOX
B3
B3
—
IN
0
0
1: Voice receive signal transmit
LEVEL SEL
0: 160 ms 1: 320 ms
RX NOISE
B2
B2
—
0
0
0: OFF 1: ON
RX NOISE
CMD1
LVL1
B1
B1
0
0
MSM7708-02
RX NOISE
CMD0
LVL0
B0
B0
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0
0