Answers Database

XC5200: Programmable keeper cells are automatically enabled when all buffers are in 3-state mode


Record #1301

Product Family:  Documentation

Product Line:  Data Book

Problem Title:
XC5200:	Programmable keeper cells are automatically enabled when all
buffers are in 3-state mode



Problem Description:
In "The Programmable Logic Data Book", 7/96 and 9/96,
on page 4-194, in paragraph 2 of column 2, it reads:

"Additionally, programmable keeper cells at the periphery can be enabled to reta
in the last valid logic level on the Long-
lines when all buffers are in 3-state mode."


Solution 1:

This passage has been a cause of much confusion.  The "program-
mable keeper cells" mentioned in this passage are said to be
"enabled", leading the reader to believe that he/she needs to
turn on a switch in the software to activate these cells.  This
is not the case.  Instead, these "programmable keeper cells"
are automatically enabled by the software whenever all buffers
are in 3-state mode.  The reader does not need to worry about
this.



End of Record #1301