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Lattice Semiconductor
Convolutional Encoder User’s Guide
Appendix for ORCA Series 4 FPGAs
Table 4. Core Con?gurations for ORCA Series 4 FPGAs
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 encoder
Puncture pattern – PP0
Puncture pattern – PP1
7
1
2
171
133
—
—
—
—
—
—
No
—
—
Supplied Netlist Con?gurations
The Ordering Part Number (OPN) for all con?gurations of this core in ORCA Series 4 devices is CONV-ENCO-04-
N1. Table 4 lists the netlist con?gurations that are available in the Evaluation Package for this core, which can be
downloaded from the Lattice web site at www.latticesemi.com.
You can use the IPexpress software tool to help generate new con?gurations of this IP core. IPexpress is the Lattice
IP con?guration utility, and is included as a standard feature of the ispLEVER design tools. Details regarding the
usage of IPexpress can be found in the IPexpress and ispLEVER help system. For more information on the
ispLEVER design tools, visit the Lattice web site at: www.latticesemi.com/software.
Table 5. Performance and Resource Utilization 1
Con?guration
conv_enco_o4_1_001.lpc
ORCA 4
PFUs 2
4
LUTs
6
Registers
16
External
I/Os
7
sysMEM?
EBRs
N/A
f MAX
(MHz)
333
Latency 3
3
1. Performance and utilization characteristics using ispLEVER v.3.0 software and targeting the OR4E02, package BA352, speed 2. Synthe-
sized using Synplicity's Synplify Pro v.7.1.1. When using this IP core in a different density, package, speed, or grade within the OR4E fam-
ily, performance and utilization may vary.
2. Programmable Function Unit (PFU) is a standard logic block of Lattice FPGA devices. For more information, check the data sheet of the
device.
3. The latency values are for din to dout with din_valid is high whenever rfi is high. The din to dout latency relationship can be
explained as follows. For non-punctured encoders, the latency value is 3 when constraint length is greater than 4, otherwise the value is 2.
For punctured encoders, the latency value is (output rate + 6) when constraint length is greater than 4, otherwise the value is (output rate +
4).
15
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