EP20K400EFC672-1X Datasheet, PDF (15/117 Pages) Altera Corporation – Programmable Logic Device Family

APEX 20K Programmable Logic Device Family Data Sheet
Figure 6. APEX 20K Carry Chain
Carry-In
a1
LUT
Register
s1
b1
Carry Chain
LE1
a2
LUT
Register
s2
b2
Carry Chain
LE2
an
LUT
Register
sn
bn
Carry Chain
LEn
LUT
Carry Chain
Register
Carry-Out
LEn + 1
Altera Corporation
15