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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： | 28/37页 |
| 文件大小： | 497K |
| 代理商： | AT76C651 |
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AT76C651
28
structure: Two equalizer structures are implemented in
the AT76C651: LE (linear equalizer) and DFE (decision
feedback equalizer). When b5 = 1, only LE structure can
be selected. In DFE mode two substructures, depending
on the position of the central tap, can be configured.
Table 16 shows the different possibilities.
step: This parameter controls the step used to adapt the
equalizer taps. The higher the step, the higher the
adaptation step.
EQUCENTRAL: 0x52 (read/write)
central tap position: EQUCENTRAL (4:0) gives the position
of the equalizer central tap. This position should be set
between 0 and 31 when EQUCFG(5)=1 and between 0 and
15 when EQUCFG(5)=0. In standard configuration this
parameter is set to 7.
adapt: The central tap adaptation mode can be selected
between the configurations shown in Table 17:
In standard configuration it is set to 11.
EQUTAPRORD: 0x53 (read/write)
b7
b6
This parameter selects the position of the equalizer tap that
we want to collect (see
“
EQUTAPREAL: 0x54/0x55 (read)
and EQUTAPIMAG: 0x56/0x57 (read)
”
). The number of
taps that can be read depends of the equalizer length (see
“
EQUCFG: 0x51 (read/write)
”
).
EQUTAPREAL: 0x54/0x55 (read) and EQUTAPIMAG:
0x56/0x57 (read)
b7
b6
b5
After selecting the equalizer tap to read (see
“
EQUTAP-
RORD: 0x53 (read/write)
”
), the real part and the imaginary
part of the tap are collected in four bytes. The first byte to
read must be 0x54. When the AT76C651 detects this
address, it memorizes the equalizer tap value (4 bytes) and
sends the 8 MSBs of the real part as read data. The three
other bytes can be collected later. The value of the tap is
equal to:
Table 16.
b4b3
Structure
00
LE
10
LE
01
DFE with central tap position between 0 and 7
11
DFE with central tap position between 8 and 15
res
adapt
0x52
b7
b6
b5
b4
b3
b2
b1
b0
central tap position
Table 17.
b6b5
Real Part
Imag Part
00
adapted
adapted
01
adapted
fixed to 0
10
fixed to 1
adapted
11
fixed to 1
fixed to 0
reserved
0x53
b5
b4
b3
b2
b1
b0
equalizer tap position
0x54 MSB
0x55 LSB
b4
b3
b2
b1
b0
equtapreal (7:0)
equtapreal (15:8)
0x56 MSB
0x57 LSB
equtapimag (7:0)
equtapimag (15:8)
real
(
j imag
)
+
signed
-----------------------------------------------------------------------+
EQUTAPREAL
(
j signed EQUTAPIMAG
16384
)
=
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