ATT3000 datasheet(8/80 Pages) ETC1

8 / 80 page

Data Sheet

ATT3000 Series Field-Programmable Gate Arrays

February 1997

Lucent Technologies Inc.

Conﬁgurable Logic Block (continued)

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

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.

Figure 6. C8BCP Macro

ANY FUNCTION

OF UP TO 4

VARIABLES

ANY FUNCTION

OF UP TO 4

VARIABLES

ANY FUNCTION

OF 5

VARIABLES

ANY FUNCTION

OF UP TO 4

VARIABLES

ANY FUNCTION

OF UP TO 4

VARIABLES

5-3104(F)

CLOCK

PARALLEL

CLOCK

TERMINAL

COUNT

FUNCTION OF 6 VARIABLES

FUNCTION OF 5 VARIABLES

DUAL FUNCTION OF

ENABLE

4 VARIABLES

5-3105(F)

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