msm7584c Oki Semiconductor, msm7584c Datasheet - Page 36

• Manufacturer Part Number: msm7584c
• Description: Pi /4 Shift Qpsk Modem/adpcm Codec
• Manufacturer: Oki Semiconductor

¡ Semiconductor
(2) CR1 (ADPCM Operation Mode Settings)
CR1
Initial Value
B7: .............. Transmit side PCM signal ON/OFF.
B6: .............. Receive side PCM signal ON/OFF.
B5: .............. ADPCM reset (as specified by G. 721)
B4: .............. Transmit side MUTE.
B3: .............. Receive side MUTE.
B2, B1, B0: An attenuation value is selected at receive side MUTE (CR1 - B3 = "1")
ON/OFF
B7
TX
0
OFF: PCM idle pattern is transmitted.
OFF: PCM idle pattern is transmitted.
(see Table 3). These bits are ORed with the external pins MLV2, MLV1, and
MLV0.
0: Transmit MUTE OFF.
1: Transmit MUTE ON.
0: Receive side MUTE OFF.
1: Receive side MUTE ON. The receive side output signals are attenuated
Transmit output is in an idle state.
by the values represented by a combination of bits B2, B1, and B0 of the
CR1. (For voice path only.)
B2
0
0
0
0
1
1
1
1
ON/OFF
B6
RX
0
Table 3 MUTE Level Settings
B1
0
0
1
1
0
0
1
1
ADPCM
RESET
B5
0
B0
0
1
0
1
0
1
0
1
This bit is ORed with the external control pin
RXMUTE.
– 6dB loss
–12dB loss
–18dB loss
–24dB loss
–30dB loss
–36dB loss
MUTE (idle state)
MUTE
B4
TX
0dB loss
0
Attenuation value
MUTE
B3
RX
0
0: ON
0: ON
1: reset
MLV2
B2
0
1: OFF
1: OFF
MLV1
B1
0
MSM7584C
MLV0
B0
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0