Digital Voice Systems VC-20-MR2, User Manual, Page: 19 / 32

Section 6 – Advanced Features
VC-20 AMBE™ Vocoder Board User’s Manual
page 11
The Speech Compression Specialists
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IGITAL
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OICE
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YSTEMS,
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3.3 VC-20-MR2 Connector Signals
Name Dir Description
+5v Pwr. 5v +/- 10%
-5v Pwr. Analog -5v +/- 10%
DESLNCE I Decoder silence control (Active Low)
DINRS I Reset Signal (Active High)
DTMF_DAT O DTMF Tone Data
DTMF_DET O DTMF Tone Detected Flag (Active High)
ECHO I Echo Cancellor Enable (Active Low)
ENSLNCE O Encoder Silence Detected (Active Low)
FMDE I Decoder frame flag (Active High)
FMEN I Encoder frame flag (Active High)
FS I Frame Steal Flag (Active Low)
GND Pwr. Digital Ground
GND Anlg Pwr. Analog Ground
HD_SD I Enable Soft-decision Decoding (Active Low)
LOST I Lost speech frame detected flag (Active High)
RATE I Rate selection pin. (High : 4.8bps., Low : 2.4bps.)
RESX O Internal Reset Status (Active Low)
RUN O Run Status Signal (Active High)
RXCK I Receive data bit clock (4.8/2.4 kHz)
RXD I Receive data I channel (MSB)
RXD0 I Receive data I channel (LSB)
RXD1 I Receive data I channel
TXCK I Transmit data bit clock (4.8/2.4 kHz)
TXD O Transmit data I channel
VAD I Voice/Silence Detection Enable (Active Low)
VCC Pwr. D5v +/- 5%
VFRO O Analog speech output signal
VRXI I Analog speech input signal
3.4 VC-20-MR2 Connector Signals