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AR# 262

XNFPREP: Certain IOB primitive configuration statements cause errors

解决方案




When using the XC3000 family IOB primitive, it is necessary to add text to it
specifying the configuration of the IOB. If the "IN:" statement is written
so that the "I" tag is listed after the "FF" or "LATCH" tag, XNFPREP may
incorrectly trim the I pin from the IOB configuration. For example, the
following configuration statement will not work correctly, as the "I"
connection will be trimmmed:


IN:FF:I:IQ OUT:OQ TRI:
wrong order -----^--^

However, a functionally identical configuration statement written with the
"I" tag before the "FF" or "LATCH" tag will work correctly, as shown below:


IN:I:FF:IQ OU:OQ TRI:
right order ------^--^


Note that it is not always necessary to use these tags. When it is necessary,
however, be sure that the "I" tag follows the "IN:" statement.

AR# 262
创建日期 08/31/2007
Last Updated 03/31/1997
状态 Archive
Type ??????