L64780 LSI Logic Corporation, L64780 Datasheet - Page 67

• Manufacturer Part Number: L64780
• Description: Dvb-t Cofdm Demodulator Technical Manual 2/00
• Manufacturer: LSI Logic Corporation

HIERARCHY COFDM Nonuniform Constellation Ratio
TPS Registers
the active TPS register) differ, the TPS_INFO_CHANGE
bit is set to 1 for one CLK18 clock cycle. When the
TPS_INFO_CHANGE interrupt is enabled and this event
occurs, the DTTV demodulator generates an interrupt to
the external microcontroller. The rule for the
TPS_INFO_CHANGE applies to all TPS data bits except
for the frame number.
When this register is read, these bits provide the last
value received by the channel, using the TPS signalling
information.
When this register is written, these bits store the next
Constellation expansion ratio that the system uses. The
values are:
The initial condition for the HIERARCHY is 0b000
(Nonhierarchical).
HIERARCHY[2:0]
000
001
010
011
100
101
110
111
Definition
Nonhierarchical
Reserved
Reserved
Reserved
Reserved
=
=
=
1
2
4
R/W [4:2]
4-15