Answers Database

XC4000: How are 4000A parts different from 4000 parts?


Record #177

Problem Title:
XC4000: How are 4000A parts different from 4000 parts?


Problem Description:
The following summarizes the differences in resources between
the 4000A and standard 4000 families of parts.	The 4000A is
basically an optimized 4000 device.  Some routing resources
were removed, as they were found to be excessive in many cases,
and the result is a smaller (and thus cheaper) die.  These devices are package a
nd pinout compatible, but NOT bitstream
compatible.  There are other specification differences, which can be found
in the 1993 data book.


			4000	4000A		Comments
			----	-----		---------
single length lines 	 8	  4		to compensate, additional pips
(connected to 					were added to these lines to
switch matrix)					provide additional
						connectivity to the remaining
						lines

horizontal		 6	  4		Additonal CLB pips were added
long lines					to these lines in the 4000A

vertical 		 6	  4		Additional CLB pips were added
long lines					to these lines in the 4000A




Solution 1:





End of Record #177