| Number | 
Description | 
Effective Date | 
| XCU010001 | 
New Marking for XC1800 Series Devices | 
Jan 14, 2000 | 
| XCU089902 | 
New Marking for Spartan Series Devices | 
Aug 30, 1999 | 
| XCU019901 | 
Decision Not To Manufacture the XC4028XLA and the XC4036XLA in the
HQ304 Package. | 
Jan 15, 1999 | 
| XCU019702 | 
Improving the Cost of Performance: XC3000 and XC3100A | 
Jan 30, 1997 | 
| XCU019701 | 
Discontinuance of Low Volume XC3X00 Packages | 
Jan 30, 1997 | 
| XCU099602 | 
XC4000 Dual Layer Metal (DLM) to Triple Layer Metal (TLM) Design Considerations | 
Sept 27, 1996 | 
| XCU099601 | 
Readback Specification Estabilished on XC4000/D/E  | 
Sept 15, 1996 |