Scan Enable Flip-Flop Characterization

023_cell : Scan Enable Flip-Flop Characterization

Minimum Required Versions: AccuCell 2.6.0.R, SmartSpice 4.6.2.R

This example explains the basics of AccuCell's characterization and modeling options for scan-enable based flip-flops using the embedded SmartSpice SPICE engine to perform characterization.

The AccuCell .cfg command SCAN_ENABLE should be specified anytime a flip-flop with scan is to be characterized. This command defines which pins are the <scan enable>, <scan data> and, <data> pins. For some cells processing may be completely automatic. Others may require the use of a .func file defined with the SYNOPSYS_FUNC_FILE .cfg file command in addition to the test function with the SNPS_TEST_FUNC_FILE command for the test_cell statement and the use of the NET_FUNC .cfg file command to define the required output pin to state variable realtionship. Any additional cell or pin attributes needed can be defined with the SNPS_CELL_ATTR and SNPS_PIN_ATTR .cfg file commands.