参数资料
| 型号： | IP-VITERBI/SS |
| 厂商： | Altera |
| 文件页数： | 38/50页 |
| 文件大小： | 0K |
| 描述： | IP VITERBI LOW-SPEED |
| 标准包装： | 1 |
| 系列： | * |
| 类型： | MegaCore |
| 功能： | Viterbi 低速编译器 |
| 许可证： | 初始许可证 |
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3–12
Chapter 3: Functional Description
Parameters
Code Sets Tab
Table 3–4 shows the options that can be set in the Code Sets tab.
Table 3–4. Code Sets Tab Options
Parameter
Number of Code Sets
Decimal or Octal
Mode
GA, GB, GC, GD, GE,
GF, GG (1)
Number of coded
Value
1 to 8
–
V or T
–
2 to 7 (hybrid)
Description
The Viterbi Compiler supports multiple code definitions. The multiple code
set option allows up to eight code sets, where a code set comprises a code
rate and associated generating polynomials.
Decimal or octal base representation for the generator polynomials. The
design file representation is decimal, but you have the option of entering in
either decimal or octal base.
Viterbi (V) or TCM mode (T).
The generator polynomials. If the multiple code set option is used, a
different set of polynomials is entered in the respective gi group. IP
Toolbench provides default values that can be overwritten by any valid
polynomial. (The wizard does not check whether the entered values are
valid.)
For every bit to be encoded, N bits are output. With the multiple code set
bits. ( N )
2 to 4 (parallel)
(2)
option there are up to 5 different N parameters, which can be in any order.
The constraint length. Defines the number of states in the convolutional
Constraint length ( L )
3 to 9
encoder, where number of states = 2 (L – 1) . You can choose different values
of L for each code set.
Notes to Table 3–4 :
(1) For the parallel architecture, only GA, GB, GC, and GD are used.
(2) Valid only for Viterbi mode. For TCM mode only N = 2 is supported.
Figure 3–10 shows the Code Sets tab.
Figure 3–10. Code Sets
Viterbi Compiler
User Guide
November 2013 Altera Corporation
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