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Lattice Semiconductor
Convolutional Encoder User’s Guide
Output Rate: This de?nes the output symbol rate for the encoder. The output rate for non-punctured codes can be
any value between from 2 to 8. For punctured codes, the output rate can be any value from 3 to 23 ( k +1 to 2 k -1,
where k is the input rate).
Generator Polynomials: GP0, GP1, GP2, GP3, GP4, GP5, GP6 and GP7 are generator polynomials. For non-
punctured encoders, the number of generator polynomials is always equal to the output rate. For punctured encod-
ers, the number of generator polynomials is 2.
Punctured Data Support: The encoder supports punctured or non-punctured data. For punctured data, the block
size (punctured block size) is equal to the input rate. The two puncture patterns PP0 and PP1 can be de?ned by the
user. The total number of 1’s in both puncture patterns must equal the output rate.
Generic Core Con?gurations
Table 2 shows the description of core con?gurations available in the standard evaluation package.
Table 2. Core Con?gurations
Con?guration #1
Constraint Length
Input Rate
Output Rate
Generator Polynomials
GP0 (Octal)
GP1 (Octal)
GP2 (Octal)
GP3 (Octal)
GP4 (Octal)
GP5 (Octal)
GP6 (Octal)
GP7 (Octal)
Punctured Data Support
Punctured Decoder
Punctured Block Size
Puncture Pattern - PP0
Puncture Pattern - PP1
7
1
2
171
133
—
—
—
—
—
—
No
—
—
—
Timing Diagrams
The top-level timing diagrams for various con?gurations are shown in Figure 6 and Figure 7.
5
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