參數(shù)資料
型號: STV8227
廠商: 意法半導(dǎo)體
英文描述: Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders
中文描述: 數(shù)字音頻解碼器/處理器為A2和麗音電視/錄像機(jī)
文件頁數(shù): 60/149頁
文件大?。?/td> 2775K
代理商: STV8227
Register List
STV82x7
60/149
Note:
These registers allow direct access to the demodulator signal detectors.
AGC_CTRL
IF AGC Control Register
Bit Name
Reset
Function
Bit [7:5]
000
Reserved.
QPSK_LK
0
QPSK Lock Detection Flag
0: Not detected
1: Detected
FM2_CAR
0
Channel 2 FM/AM Carrier Detection Flag
0: Not detected
1: Detected
FM2_SQ
0
Channel 2 FM Squelch Detection Flag
0: Not detected
1: Detected
FM1_CAR
0
Channel 1 FM/AM Carrier Detection Flag
0: Not detected
1: Detected
FM1_SQ
0
Channel 1 FM Squelch Detection Flag
0: Not detected
1: Detected
Address: 0Eh
Type: R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
AGC_CMD
0
0
AGC_REF[2:0]
AGC_CST[1:0]
Bit Name
Reset
Function
AGC_CMD
0
Automatic Gain Control Command Mode
Normally set to 0 enabling automatic mode. For L/L standards, the AGC should be switched off
due to the presence of the AM sound carrier. In this case, a fixed gain value should be set using
the AGCS register.
0: Automatic mode. AGC controlled by the Autostandard function. (Default)
1: Manual/Forced mode
Bits[6:5]
00
Reserved.
AGC_REF[2:0]
100
This bitfield is used to defines the clipping level which adjusts the allowable proportion of samples
at the input of the ADC which will be clipped. The AGC tries to maximize the use of the full scale
range of the ADC. The default setting gives a ratio of 1/256.
Clipping Ratio
Clipping Ratio
000:
001:
010:
011:
1/16 (Single carrier)
1/32
1/64
1/128
100:
101:
110:
111:
1/256 (Default)
1/512
1/1024
1/2048 (Multiple carriers)
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