FINAL
COM’L: H-5/7/10/15/25, Q-10/15/25
IND: H-15/25, Q-20/25
PALCE20V8 Family
EE CMOS 24-Pin Universal Programmable Array Logic
DISTINCTIVE CHARACTERISTICS
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Pin and function compatible with all GAL
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Advanced
Micro
Devices
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Peripheral Component Interconnect (PCI)
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s
s
s
s
s
s
s
s
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20V8/As
Electrically erasable CMOS technology pro-
vides reconfigurable logic and full testability
High-speed CMOS technology
— 5-ns propagation delay for “-5” version
— 7.5-ns propagation delay for “-7” version
Direct plug-in replacement for a wide range of
24-pin PAL devices
Programmable enable/disable control
Outputs individually programmable as
registered or combinatorial
compliant
Preloadable output registers for testability
Automatic register reset on power-up
Cost-effective 24-pin plastic SKINNYDIP and
28-pin PLCC packages
Extensive third-party software and programmer
support through FusionPLD partners
Fully tested for 100% programming and func-
tional yields and high reliability
Programmable output polarity
5-ns version utilizes a split leadframe for
improved performance
GENERAL DESCRIPTION
The PALCE20V8 is an advanced PAL device built with
low-power, high-speed, electrically-erasable CMOS
technology. Its macrocells provide a universal device
architecture. The PALCE20V8 is fully compatible with
the GAL20V8 and can directly replace PAL20R8 series
devices and most 24-pin combinatorial PAL devices.
Device logic is automatically configured according to the
user’s design specification. A design is implemented
using any of a number of popular design software pack-
ages, allowing automatic creation of a programming file
based on Boolean or state equations. Design software
also verifies the design and can provide test vectors for
the finished device. Programming can be accomplished
on standard PAL device programmers.
The PALCE20V8 utilizes the familiar sum-of-products
(AND/OR) architecture that allows users to implement
complex logic functions easily and efficiently. Multiple
levels of combinatorial logic can always be reduced to
sum-of-products form, taking advantage of the very
wide input gates available in PAL devices. The equa-
tions are programmed into the device through floating-
gate cells in the AND logic array that can be erased
electrically.
The fixed OR array allows up to eight data product terms
per output for logic functions. The sum of these products
feeds the output macrocell. Each macrocell can be
programmed as registered or combinatorial with an
active-high or active-low output. The output configura-
tion is determined by two global bits and one local bit
controlling four multiplexers in each macrocell.
BLOCK DIAGRAM
10
I
1
– I
10
CLK/I
0
Programmable AND Array
40 x 64
Input
Mux.
MACRO
MC
0
MACRO
MC
1
MACRO
MC
2
MACRO
MC
3
MACRO
MC
4
MACRO
MC
5
MACRO
MC
6
MACRO
MC
7
Input
Mux.
OE/I
11
I
12
Publication#
16491
Rev.
D
Issue Date:
February 1996
I/O
0
I/O
1
I/O
2
I/O
4
I/O
4
I/O
5
I/O
6
I/O
7
I
13
16491D-1
Amendment
/0
2-155
AMD [ ADVANCED MICRO DEVICES ]
