ATT3042 查看數據表（PDF） - Unspecified

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ATT3042

Field-Programmable Gate Arrays

Unspecified 

ATT3000 Series Field-Programmable Gate Arrays

Data Sheet

February 1997

Configurable Logic Block (continued)

A

B

QX

QY

C

D

E

A

B

QX

QY

C

D

E

A

B

QX

QY

C

D

E

ANY FUNCTION

OF UP TO 4

F

VARIABLES

ANY FUNCTION

OF UP TO 4

VARIABLES

G

5A

ANY FUNCTION

OF 5

VARIABLES

F

G

5B

Figure 6 shows a modulo 8 binary counter with parallel

enable. It uses one CLB of each type. The partial func-

tions of six or seven variables are implemented by

using the input variable (.e) to dynamically select

between two functions of four different variables. For

the two functions of four variables each, the indepen-

dent results (F and G) may be used as data inputs to

either flip-flop or logic block output. For the single func-

tion of five variables and merged functions of six or

seven variables, the F and G outputs are identical.

Symmetry of the F and G functions and the flip-flops

allows the interchange of CLB outputs to optimize

routing efficiencies of the networks interconnecting

the logic and IOBs.

CLOCK

ENABLE

PARALLEL

ENABLE

CLOCK

DUAL FUNCTION OF

4 VARIABLES

TERMINAL

COUNT

DQ

Q0

D0

A

B

QX

QY

C

D

A

B

QX

QY

C

D

ANY FUNCTION

OF UP TO 4

VARIABLES

ANY FUNCTION

OF UP TO 4

VARIABLES

F

M

U

X

G

E

5C

5-3104(F)

5A. Combinatorial Logic Option 1 generates two functions of four

variables each. One variable, A, must be common to both func-

tions. The second and third variables can be any choice among

B, C, Qx, and Qy. The fourth variable can be either D or E.

5B. Combinatorial Logic Option 2 generates any function of five

variables: A, D, E, and two choices among B, C, Qx, Qy.

5C. Combinatorial Logic Option 3 allows variable E to select

between two functions of four variables: both have common

inputs, A and D, and any choice among B, C, Qx, and Qy for

the remaining two variables. Option 3 can then implement

some functions of six or seven variables.

Figure 5. Combinatorial Logic Diagram

8

DQ

Q1

D1

FUNCTION OF 5 VARIABLES

DQ

Q2

D2

FUNCTION OF 6 VARIABLES

Figure 6. C8BCP Macro

5-3105(F)

Lucent Technologies Inc.

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