AR# 472: Differences between the 7318/7336 and 7354/7372/73108/73144
AR# 472
Differences between the 7318/7336 and 7354/7372/73108/73144
Description
Engineers designing for the XC7300 family of EPLDs should be aware of the following architechtural differences between members of this family:
XC7318/36/144 vs. XC7354/72/108 Fast Function Blocks ============================================================ XC7318/36/144 XC7354/72/108 ------------------------------------------------------------ Output polarity control Fixed output polarity Direct support for D- or T-flip-flop D-flip-flop only Flip-flop asynchronous set or reset Flip-flop asynchronous set only
XC7318/36 vs. XC7354/72/108/144 I/O Blocks ============================================================ XC7318/36 XC7354/72/108/144 ------------------------------------------------------------ Direct input only Direct, latched, or registered input No input polarity control Input polarity control
Also note that, because the XC7318 and XC7336 contain only Fast Function Blocks, all flip-flop clock signals must be on the FCLK nets, and all output enable signals must be on the global FOE nets.