FLEX8000 데이터 시트보기 (PDF) - Altera Corporation

부품명

상세내역

제조사

FLEX8000

Programmable Logic Device Family

Altera Corporation 

Altera Corporation

FLEX 8000 Programmable Logic Device Family Data Sheet

Figure 4. FLEX 8000 Carry Chain Operation

Carry-In

a1

LU

Register

s1

b1

Carry

LE1

a2

LUT

Register

s2

b2

Carry Chain

LE2

3

an

LUT

Register

sn

bn

Carry Chain

LEn

LUT

Register

Carry-Out

Carry Chain

LEn + 1

Cascade Chain

With the cascade chain, the FLEX 8000 architecture can implement

functions that have a very wide fan-in. Adjacent LUTs can be used to

compute portions of the function in parallel; the cascade chain serially

connects the intermediate values. The cascade chain can use a logical AND

or logical OR (via De Morgan’s inversion) to connect the outputs of

adjacent LEs. Each additional LE provides four more inputs to the

effective width of a function, with a delay as low as 0.6 ns per LE.

9

Share Link: