參數(shù)資料
型號: STA400A
廠商: 意法半導(dǎo)體
英文描述: XMRADIO SDARS CHANNEL DECODER
中文描述: XMRADIO衛(wèi)星數(shù)字收音機信道解碼器
文件頁數(shù): 42/117頁
文件大?。?/td> 910K
代理商: STA400A
STA400A
42/117
2.2 QPSK Demodulator (S1-Early/S2-Late)
The two QPSK demodulators (S1-Early and S2-Late) have the same register set so they have been listed below
once. The registers have different addresses and the same reset value except for the IFFREQ register.
QPSK_DEMOD_EN - QPSK Demodulator Enable Register
This register disables the QPSK demodulator when bit-0 is set to '0'. When disabled the demodulator output is
fixed to '0x00' or to '0x80' depending on the bit-4 setting of the QPSK_CTRL register (address 0x005A/0x0080)
b7-b1:
b0:
Not Used
0=Demodulator disabled; 1=Demodulator enabled.
DEM_EN
QPSK_CTRL - QPSK Demodulator Control Register
This is a control register for the QPSK demodulator.
b7:
AVG_OFF
This bit disables the averager filter of the integrators.
0=Averager Filter enabled; 1=Averager Filter disabled.
This bit enables/disables the NULOFS block.
0=Disabled; 1=Enabled.
Reserved.
Output Data Format.
0=Two's complement; 1=Offset binary.
This bit swaps the I and Q component of the demodulator output.
0=No Change; 1=Swaps I with Q.
This bit inverts the Q component sign in the I/Q mixer.
0=No invertion; 1=Sign invertion.
This bit inverts the timing loop sign.
0=No invertion; 1=Sign invertion.
This bit inverts the carrier loop sign.
0=No invertion; 1=Sign invertion.
b6:
NULOFS_EN
b5:
b4:
DEM2TDM_FMT
b3:
IQSWAP
b2:
QCHS
b1:
TIMCHS
b0:
CARCHS
Type:
SingleByte - R/W
Word Length:
1
Byte Name
Address (Hex)
Bit Map
Reset Value (Hex)
QPSK_DEMOD_EN1 S1/S2
0059/007F
7-0
01
Type:
SingleByte - R/W
Word Length:
8
Byte Name
Address (Hex)
Bit Map
Reset Value (Hex)
QPSK_CTRL S1/S2
005A/0080
7-0
4F
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