5

ATF1502AS(L)

0995K–PLD–6/05

The clock itself can be either one of the Global CLK signals (GCK[0 : 2]) or an individual prod-

uct term. The flip-flop changes state on the clock’s rising edge. When the GCK signal is used

as the clock, one of the macrocell product terms can be selected as a clock enable. When the

clock enable function is active and the enable signal (product term) is low, all clock edges are

ignored. The flip-flop’s asynchronous reset signal (AR) can be either the Global Clear

(GCLEAR), a product term, or always off. AR can also be a logic OR of GCLEAR with a prod-

uct term. The asynchronous preset (AP) can be a product term or always off.

Extra Feedback

The ATF1502AS(L) macrocell output can be selected as registered or combinatorial. The

extra buried feedback signal can be either combinatorial or a registered signal regardless of

whether the output is combinatorial or registered. (This enhancement function is automatically

implemented by the fitter software.) Feedback of a buried combinatorial output allows the cre-

ation of a second latch within a macrocell.

I/O Control

The output enable multiplexer (MOE) controls the output enable signal. Each I/O can be indi-

vidually configured as an input, output or for bi-directional operation. The output enable for

each macrocell can be selected from the true or compliment of the two output enable pins, a

subset of the I/O pins, or a subset of the I/O macrocells. This selection is automatically done

by the fitter software when the I/O is configured as an input, all macrocell resources are still

available, including the buried feedback, expander and cascade logic.

Global Bus/Switch

Matrix

The global bus contains all input and I/O pin signals as well as the buried feedback signal from

all 32 macrocells. The switch matrix in each logic block receives as its inputs all signals from

the global bus. Under software control, up to 40 of these signals can be selected as inputs to

the logic block.

Foldback Bus

Each macrocell also generates a foldback product term. This signal goes to the regional bus

and is available to four macrocells. The foldback is an inverse polarity of one of the macrocell’s

product terms. The four foldback terms in each region allow generation of high fan-in sum

terms (up to nine product terms) with little additional delay.

Programmable

Pin-keeper

Option for

Inputs and I/Os

The ATF1502AS offers the option of programming all input and I/O pins so that pin-keeper cir-

cuits can be utilized. When any pin is driven high or low and then subsequently left floating, it

will stay at that previous high or low level. This circuitry prevents unused input and I/O lines

from floating to intermediate voltage levels, which causes unnecessary power consumption

and system noise. The keeper circuits eliminate the need for external pull-up resistors and

eliminate their DC power consumption.