MC92314 Datasheet, PDF (60/100 Pages) Motorola, Inc – DVB-T Single Chip Demodulator Application Note

Freescale Semiconductor, Inc.
DVB-T Demodulator Interfaces
NOTE
Note that the initial values of this register may be changed during the
initialisation of the device.
Note also that the ATPS Bit must be set to 0 to write into this register
successfully. As the transmission parameters are available after
decoding the TPS information any change in this register is beyond
the normal use.
Table 4-4. OFDM Register 1 ($0C, W)
RESERVED BIT[7:4] ASYN BIT[3]
ATPS BIT[2]
AFC BIT[1] TSM BIT[0]
ation ^{0001: (I.V.)}
0: MANUAL
SWITCH
1: AUTOMATIC
SWITCH (I.V.)
0: MANUAL LOAD
1: AUTOMATIC
SETTING FROM TPS
(I.V.)
0: COARSE
ACQUISITION
(I.V.)
1: FINE
ACQUISITION
0: COARSE
ACQUISITION
(I.V.)
1: FINE
ACQUISITION
rm _{Time Sync Mode [TSM]: The OFDM block has two different modes to achieve and track the time}
fo ^{synchronisation. Depending from bit O[11] it changes automatically from coarse mode (achieve}
sync) to fine mode (track sync). In some rare cases it might be necessary to set the mode
In _{manually using this bit. If bit O[11] is set to 1 the Time Sync Mode bit has no effect.}
ry AFC Mode [AFC]: The OFDM block has two different modes to achieve and track the frequency
a synchronisation. Depending from bit O[11] it changes automatically from coarse mode
in ^{(continous sweep through the available offset frequency range) to fine mode (track sync by using}
the pilot carriers). In some rare cases it might be necessary to set the mode manually using this
lim ^{bit. If bit O[11] is set to 1 the AFC Mode bit has no effect.}
e OFDM Mode Setting [ATPS]: This bit is used to switch between Automatic mode selection
r _{(modulation and coderate set based on the decoded TPS values) and manual mode setting. If}
P _{set to 0 the manual mode settings must be loaded into the corresponding bits in the OFDM Mode}
register 0 as shown in Table 4-3. The initial value after reset is 1, corresponding to automatic
setting.
OFDM Sync Mode Setting [ASYN]: The changeover from coarse to fine acquisition mode for
time sync and AFC control is normally done automatically. This automatic switch can be
disabled, the initial value set after reset is automatic changeover.
MOTOROLA
4-12
Single Chip DVB-T Demodulator - Rev. 1.3 (11/30/98)
For More Information On This Product,
Go to: www.freescale.com