L64777 LSI Logic Corporation, L64777 Datasheet - Page 37
L64777
Manufacturer Part Number
L64777
Description
DVB Qam Modulator
Manufacturer
LSI Logic Corporation
Datasheet
1.L64777.pdf
(124 pages)
- Current page: 37 of 124
- Download datasheet (989Kb)
2.8 Convolutional Interleaver
Figure 2.15 is a block diagram of a convolutional interleaver system,
which rearranges the ordering of a sequence of symbols in a
deterministic manner. A (B, N) periodic interleaver has the following
characteristics:
The scheme is also referred to as a convolutional interleaver/
deinterleaver (based on the Forney approach).
Figure 2.15 Interleaver Block Diagram
Encoder
The L64777 interleaver performs periodic interleaving with two fixed
parameters: B, the desired interleaving depth, and M, defined as:
The values of the interleaver in the L64777 are: N = 204, B = 12, and
M = 17. You can switch off the interleaver. It is fully transparent with an
intrinsic delay of three clock cycles.
The main modules are a set of configured RAM-based delay lines to
implement the proper delay for individual data bytes, and a controller to
handle and generate the strobes needed by subsequent modules in the
data path.
Convolutional Interleaver
The minimum separation at the interleaver output is B symbols for
any two symbols that are separated by less than N symbols at the
interleaver input.
Any burst of b < B errors inserted by the channel results in single
errors at the deinterleaver output.
M
(B
2M
1)M
T
M
=
CHANNEL
N
--- -
B
(B
M
2M
1)M
Decoder
2-23
T
Related parts for L64777
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Mpeg-2 Audio/video Decoder
Manufacturer:
LSI Logic Corporation
Datasheet:
Part Number:
Description:
Satellite Decoder Technical Manual 5/97
Manufacturer:
LSI Logic Corporation
Datasheet:
Part Number:
Description:
Satellite Receiver
Manufacturer:
LSI Logic Corporation
Datasheet:
Part Number:
Description:
Tuner/receiver Chipset
Manufacturer:
LSI Logic Corporation
Datasheet:
Part Number:
Description:
Tuner And Satellite Receiver Chipset Data Sheet 2/01
Manufacturer:
LSI Logic Corporation
Datasheet:
Part Number:
Description:
Smatv Qam Encoder
Manufacturer:
LSI Logic Corporation
Datasheet:
Part Number:
Description:
Dvb-t Cofdm Demodulator Technical Manual 2/00
Manufacturer:
LSI Logic Corporation
Datasheet:
Part Number:
Description:
16-Bit HCMOS Multiplier / Accumulators
Manufacturer:
LSI Logic Corporation
Part Number:
Description:
Transport with Embedded CPU and Control
Manufacturer:
LSI Logic Corporation
Part Number:
Description:
32-Bit HCMOS IEEE Floating-Point Processor
Manufacturer:
LSI Logic Corporation
Part Number:
Description:
Controllers, Transport Controller with Embedded MIPS CPU (TR4101)
Manufacturer:
LSI Logic Corporation
Datasheet:
Part Number:
Description:
Variable-Length Video Shift Registers
Manufacturer:
LSI Logic Corporation