Table 3 Logic element(s) found recurring in the critical path of different asynchronous RCAs
From: Area/latency optimized early output asynchronous full adders and relative-timed ripple carry adders
Full adder comprising the RCA; RCA type is given alongside | Critical path logical elements |
|---|---|
Singh (1981)—strong | 2 CE2, 2 OR3 |
Sparsø and Staunstrup (1993)—strong | CE2, OR4 |
Toms (2006)—strong | CE2, 2 OR2 |
Sparsø and Staunstrup (1993)—weak | CE2, OR3 |
Toms and Edwards (2010)—weak | AND2, CE2, OR3 |
Folco et al. (2005)—weak | CE2, OR2 |
Balasubramanian and Edwards (2008c)—weak | AO222 |
Balasubramanian (2015)—weak | AO21 |
Balasubramanian (2011)—early output | AO22 |
Seitz (1979) Early output version—relative-timed | AND3, OR3 |
AOPT_EO_FA (proposed)—relative-timed | AO22 |
LOPT_EO_FA (proposed)—relative-timed | AO21 |