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参数资料
| 型号： | AT76C651 |
| 厂商： | ATMEL CORP |
| 元件分类： | 消费家电 |
| 英文描述： | Digital Reception/Transmission Integrated DVB compliant QAM Demodulator(兼容DVB的正交振幅调制解调电路) |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封装： | TQFP-100 |
| 文件页数： | 31/37页 |
| 文件大小： | 497K |
| 代理商： | AT76C651 |
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AT76C651
31
General Monitoring
LOCK: 0x80 (read)
This monitoring register indicates the lock status of AGC1,
AGC2, timing recovery, carrier recovery, equalizer, FEC
and the PLL.
fec: Lock signal for FEC
car: Lock signal for carrier recovery
equ: Lock signal for equalizer
tim: Lock signal for timing recovery
agc2: Lock signal for digital AGC (AGC2)
agc1: Lock signal for analog AGC (AGC1)
adc: Lock signal for AGC1 power reference value
adaptation
pll: Lock signal for PLL
BER1: 0x81 to 0x83 (read)
This monitoring register indicates the bit error rate estimate
over the last 10
8
bits. This register indicates the number of
corrected bit errors in the last 10
8
bits, but does not take
into account the frames that are not correctable, i.e., the
frames in which more than eight errors have occurred (this
value can be monitored in register NPERR).
b7
b6
b5
b4
BER2: 0x84 (read)
This monitoring register indicates another bit error rate esti-
mate based on a counter of false frame synchronization
words. This register is meaningful when the bit error rate is
greater than 10
-3
. The bit error rate is given by:
NPERR: 0x85 (read)
This monitoring register indicates the number of uncorrect-
able frames in the last 10
8
bits. The value is saturated at
255 if more than 255 uncorrectable frames have occurred.
b7
b6
b5
b4
TIMFREQOFF: 0x86 to 0x88 (read)
This monitoring register indicates the value of the recov-
ered symbol rate offset with respect to the configured
symbol rate (see
“
Symbol Rate
”
on page 13).
Timfreqoff is a positive integer value directly read in the
loop filter memory. This value is scaled by a gain factor K
l
inside the chip and is added to the configured symbol rate.
The result is used to control the timing of the numerically
controlled oscillator, and is the recovered symbol rate.
Therefore, it is possible to compute the real recovered sym-
bol rate offset
T (in Hz) with the following formula:
timfreqoff
--------------------------------------
=
The scaling factor K
l
is internally defined as the approxima-
tion of the configured symbol rate given in the following
formula:
K
l
floor
mantissa
2
=
where exponent and mantissa are the configured symbol
rate exponent plus 10 and symbol rate mantissa (see
“
Symbol Rate
”
on page 13).
fec
equ
car
tim
0x80
b7
b6
b5
b4
b3
b2
b1
b0
agc
2
agc
1
adc
pll
reserved
0x81
b3
b2
b1
b0
ber1(20:16)
0x82
ber1(15:8)
0x83
ber1(7:0)
4096
------------
ber2
0x84
b7
b6
b5
b4
b3
b2
b1
b0
nperr
0x85
b3
b2
b1
b0
0x86
0x87
b7
b6
b5
b4
b3
b2
b1
b0
timfreqoff (15:8)
timfreqoff (23:16)
0x88
timfreqoff (7:0)
T
K
l
×
2
29
(
16
–
)
2
4
–
×
2
exponent-10
×
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