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Lattice Semiconductor
IP Core Generation
Figure 4-3. LatticeECP3 CIC Filter IP Core Directory Structure
Table 4-1 provides a list of key files created by the IPexpress tool and how they are used. The IPexpress tool cre-
ates several files that are used throughout the design cycle. The names of most of the created files are customized
to the user’s module name specified in the IPexpress tool.t
Table 4-1. File List
File
< username >_inst.v
< username >_bb.v
< username >.ngo
< username >.ipx
< username >.lpc
< username >_top.[v,vhd]
< username >_generate.tcl
Description
This file provides an instance template for the IP.
This file provides the synthesis black box for the user’s synthesis.
The ngo files provide the synthesized IP core.
The IPX file holds references to all of the elements of an IP or Module after it is generated from
the IPexpress tool (Diamond version only). The file is used to bring in the appropriate files during
the design implementation and analysis. It is also used to re-load parameter settings into the
IP/Module generation GUI when an IP/Module is being re-generated.
This file contains the IPexpress tool options used to recreate or modify the core in the IPexpress
tool.
This file provides a module which instantiates the CIC IP core. This file can be easily modified for
the user's instance of the CIC IP core. This file is located in the
cic_filter_eval/< username >/src/rtl/top/ directory.
Created when the GUI Generate button is pushed, this file invokes generation, may be run from
command line.
< username >_generate.log This is the IPexpress scripts log file.
< username >_gen.log
This is the IPexpress IP generation log file
IPUG42_02.6, August 2010
24
Cascaded Integrator-Comb (CIC) Filter User’s Guide
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