AR# 4394


Foundation F1.5: Selecting the default FSM encoding scheme for Express HDL designs


Keywords: FSM, Foundation Express, CPLD, FPGA, one-hot, binary, encoding

Urgency: Standard

General Description:
There are two Finite State Machine encoding styles available in Express:
one-hot and binary. The current default is one-hot encoding, but the CPLD
archtecture (XC9500) exhibits better performance using binary encoding.


For CPLD devices, select Synthesis -> Options and set FSM Synthesis: Default
Encoding to "Binary".

The encoding style is determined upon analysis of the HDL source, so if HDL
files have already been added to the project, you must also select
Synthesis -> Force Analysis of All HDL Source Files for this change to take
AR# 4394
日期 09/17/2002
状态 Archive
Type 综合文章
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