PALCE29M16H-25 AMD [Advanced Micro Devices], PALCE29M16H-25 Datasheet - Page 19

• Manufacturer Part Number: PALCE29M16H-25
• Description: 24-Pin EE CMOS Programmable Array Logic
• Manufacturer: AMD [Advanced Micro Devices]

PRELOAD
The PALCE29M16 has the capability for product-term
Preload. When the global-preload product term is true,
the PALCE29M16 will enter the preload mode. This fea-
ture aids functional testing by allowing direct setting of
register states. The procedure for Preload is as follows:
Parameter
Set the selected input pins to the user selected
preload condition.
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.
Symbol
t
t
t
I/O
W
D
Pin 1 (2)
I/O Pins
Inputs
CLK
Parameter Description
Delay Time
Pulse Width
Valid Output
t
D
Preload Waveform
PALCE29M16H-25
t
D
Preload Mode
Data to be
Preloaded
t
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.
W
Min
250
100
0.5
Pulse the clock pin (pin 1).
Remove the inputs to the I/O pins.
Remove the Preload condition.
Verify V
grammed pattern.
OL
/V
OH
t
D
Rec.
500
1.0
for all output pins as per pro-
t
IO
Max
700
500
5.0
V
V
V
V
V
V
IH
IL
OH
OL
IH
IL
08740G-36
AMD
/
/
V
Unit
V
ns
ns
IL
IH
s
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