ep2c35 Altera Corporation, ep2c35 Datasheet - Page 17

• Manufacturer Part Number: ep2c35
• Description: Cyclone Ii Device Family Data Sheet
• Manufacturer: Altera Corporation

Figure 2–3. LE in Normal Mode
Altera Corporation
February 2007
data1
data2
data3
cin (from cout
of previous LE)
data4
Packed Register Input
Register Feedback
Four-Input
Arithmetic Mode
The arithmetic mode is ideal for implementing adders, counters,
accumulators, and comparators. An LE in arithmetic mode implements a
2-bit full adder and basic carry chain (see
mode can drive out registered and unregistered versions of the LUT
output. Register feedback and register packing are supported when LEs
are used in arithmetic mode.
LUT
Register chain
connection
clock (LAB Wide)
(LAB Wide)
ena (LAB Wide)
aclr (LAB Wide)
sload
(LAB Wide)
sclear
Cyclone II Device Handbook, Volume 1
ENA
D
CLRN
Figure
Q
2–4). LEs in arithmetic
Cyclone II Architecture
Row, Column, and
Direct Link Routing
Row, Column, and
Direct Link Routing
Local routing
Register
chain output
2–5