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Si4840/44-A10
Table 13. Si4840/44-A10 AM/SW Receiver Command Summary
Cmd
0xE0
0xE1
0xE2
0x10
0x11
0x12
0x13
Name
ATDD_GET_STATUS
ATDD_POWER_UP
ATDD_AUDIO_MODE
GET_REV
POWER_DOWN
SET_PROPERTY
GET_PROPERTY
Description
Get tune freq, band and etc status of the device
Power up device, band selection and band properties setup
Audio output mode: get/set audio mode settings.
Returns the revision information of the device.
Power down device.
Sets the value of a property.
Retrieve a property's value.
Note: The si4840/44 has its own power up and get status commands which is different from previous si47xx tuner parts. To
differentiate, we use “ATDD_POWER_UP” and ATDD_GET_STATUS to denote the ATDD specific commands instead
of the general Si47xx “POWER_UP” and “STATUS” commands.
Table 14. Si4840/44-A10 AM/SW Receiver Property Summary
Prop
0x4000
0x4001
Name
RX_VOLUME
RX_HARD_MUTE
Description
Sets the output volume.
Mutes the audio output. L and R audio outputs may be
Default
0x003F
0x0000
muted independently.
0x4002
0x4003
0x3300
RX_BASS_TREBLE
RX_ACTUAL_VOLUME
AM_SOFT_MUTE_RATE
Sets the output bass/treble level
Read the actual output volume
Sets the attack and decay rates when entering and leaving
0x0003
0x003F
0x0040
soft mute.
0x3301
AM_SOFT_MUTE_SLOPE
Configures attenuation slope during soft mute in dB attenu-
0x0002
ation per dB SNR below the soft mute SNR threshold.
0x3302
0x3303
AM_SOFT_MUTE_
MAX_ATTENUATION
AM_SOFT_MUTE_
Sets maximum attenuation during soft mute (dB). Set to 0
to disable soft mute.
Sets SNR threshold to engage soft mute.
0x0010
0x0008
SNR_THRESHOLD
18
Rev.1.0
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