EP2C15QQ324C6N 查看數據表（PDF） - Altera Corporation

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EP2C15QQ324C6N

Section I. Cyclone II Device Family Data Sheet

Altera Corporation 

Figure 2–3. LE in Normal Mode

Packed Register Input

sload

sclear

(LAB Wide) (LAB Wide)

Register chain

connection

Cyclone II Architecture

data1

data2

data3

cin (from cout

of previous LE)

data4

Four-Input

LUT

clock (LAB Wide)

ena (LAB Wide)

aclr (LAB Wide)

Q

D

ENA

CLRN

Row, Column, and

Direct Link Routing

Row, Column, and

Direct Link Routing

Local routing

Register Feedback

Register

chain output

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 Figure 2–4). LEs in arithmetic

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.

Altera Corporation

February 2007

2–5

Cyclone II Device Handbook, Volume 1

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