Description
No. Checksum is a simple sum of the number of programmed bits in the pattern. It is a concept that had moderate value for simple programmable logic devices (PLDs) with less than 16 logic cells. However, even with those smaller devices, the value was far from unique. As devices have gotten larger, this summing of the number of bits is of less value.
Altera does not recommend using checksums as a means of uniquely representing a pattern in a device. Altera recommends using a verify operation to confirm that a device has been programmed with the correct pattern.
The Joint Test Action Group (JTAG) IEEE 1149.1 specification also provides a better mechanism for providing a unique signature for the pattern, called the USERCODE instruction. APEXTM 20K, APEX 20KE, ACEXTM 1K, FLEX® 10K, FLEX 10KA, FLEX 10KE, MAX® 7000AE, MAX 7000B, MAX 3000A, and EPC devices support the optional USERCODE instruction.