PALCE29MA16 datasheet(22/25 Pages) AMD

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AMD

2-370

PALCE29MA16H-25

PRELOAD

The PALCE29MA16 has the capability for product-term

Preload. When the global-preload product term is true,

the PALCE29MA16 will enter the preload mode. This

feature aids functional testing by allowing direct setting

of register states. The procedure for Preload is as

follows:

s Set the selected input pins to the user selected

preload condition.

s Apply the desired register value to the I/O pins.

This sets Q of the register. The value seen on the

I/O pin, after Preload, will depend on whether the

macrocell is active high or active low.

s Pulse the clock pin (pin 1).

s Remove the inputs to the I/O pins.

s Remove the Preload condition.

s Verify VOL/VOH for all output pins as per pro-

grammed pattern.

Because the Preload command is a product term, any

input to the array can be used to set Preload (including

I/O pins and registers). Preload itself will change the val-

ues of the I/O pins and registers. This will have unpre-

dictable results. Therefore, only dedicated input pins

should be used for the Preload command.

Parameter

Symbol

Parameter Description

Min

Rec.

Max

Unit

Delay Time

0.5

1.0

5.0

µs

Pulse Width

250

500

700

tI/O

Valid Output

100

500

VIH

Inputs

I/O Pins

CLK

Pin 1 (2)

VIL

VOH/VIH

VOL/VIL

VIL

VIH

tIO

Preload Mode

Data to be

Preloaded

08811G-42

Preload Waveform

PALCE29MA16 Datasheet(PDF) 22 Page - Advanced Micro Devices

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