GAL26CLV12
Low Voltage E
2
CMOS PLD
Generic Array Logic™
FEATURES
Features
• HIGH PERFORMANCE E
2
CMOS
®
TECHNOLOGY
— 5 ns Maximum Propagation Delay
— Fmax = 200 MHz
— 3.5 ns Maximum from Clock Input to Data Output
— UltraMOS
®
Advanced CMOS Technology
• 3.3V LOW VOLTAGE 26CV12 ARCHITECTURE
— JEDEC-Compatible 3.3V Interface Standard
— Inputs and I/O Interface with Standard 5V TTL Devices
• ACTIVE PULL-UPS ON ALL PINS
• E
2
CELL TECHNOLOGY
— Reconfigurable Logic
— Reprogrammable Cells
— 100% Tested/100% Yields
— High Speed Electrical Erasure (<100ms)
— 20 Year Data Retention
• TWELVE OUTPUT LOGIC MACROCELLS
— Maximum Flexibility for Complex Logic Designs
— Programmable Output Polarity
• PRELOAD AND POWER-ON RESET OF ALL REGISTERS
— 100% Functional Testability
• APPLICATIONS INCLUDE:
— Glue Logic for 3.3V Systems
— DMA Control
— State Machine Control
— High Speed Graphics Processing
— Standard Logic Speed Upgrade
• ELECTRONIC SIGNATURE FOR IDENTIFICATION
I
Discontinued Product (PCN #02-06). Contact Rochester Electronics for Availability.
www.latticesemi.com/sales/discontinueddevicessales.cfm
Functional Block Diagram
I/CLK
RESET
INPUT
8
I
8
I
8
I
8
I
OLMC
I/O/Q
OLMC
I/O/Q
OLMC
I/O/Q
PROGRAMMABLE
AND-ARRAY
(122X52)
OLMC
I/O/Q
10
OLMC
I/O/Q
I
12
OLMC
I/O/Q
I
12
OLMC
I/O/Q
I
10
OLMC
I/O/Q
I
8
I
8
I
8
I
8
OLMC
I/O/Q
OLMC
I/O/Q
OLMC
I/O/Q
OLMC
PRESET
I/O/Q
Description
The GAL26CLV12D, at 5 ns maximum propagation delay time,
provides higher performance than its 5V counterpart. The
GAL26CLV12D can interface with both 3.3V and 5V signal levels.
The GAL26CLV12D is manufactured using Lattice Semiconductor's
advanced 3.3V E
2
CMOS process, which combines CMOS with
Electrically Erasable (E
2
) floating gate technology. High speed erase
times (<100ms) allow the devices to be reprogrammed quickly and
efficiently.
The generic architecture provides maximum design flexibility by
allowing the Output Logic Macrocell (OLMC) to be configured by
the user.
Unique test circuitry and reprogrammable cells allow complete AC,
DC, and functional testing during manufacture. As a result, Lattice
Semiconductor delivers 100% field programmability and function-
ality of all GAL products. In addition, 100 erase/write cycles and
data retention in excess of 20 years are specified.
Pin Configuration
PLCC
I/CLK
I/O/Q
I/O/Q
26
25
I
I
2
4
I
28
I
I
VCC
I
I
I
I
5
I
I/O/Q
I/O/Q
I/O/Q
I/O/Q
GND
I/O/Q
I/O/Q
7
GAL26CLV12D
Top View
23
9
21
11
12
14
16
19
18
I/O/Q
I/O/Q
I/O/Q
Copyright © 1997 Lattice Semiconductor Corp. All brand or product names are trademarks or registered trademarks of their respective holders. The specifications and information herein are subject
to change without notice.
I/O/Q
I
I
I
LATTICE SEMICONDUCTOR CORP., 5555 Northeast Moore Ct., Hillsboro, Oregon 97124, U.S.A.
Tel. (503) 268-8000; 1-800-LATTICE; FAX (503) 268-8556; http://www.latticesemi.com
July 1997
26clv12_02
1
Specifications
GAL26CLV12
Discontinued Product (PCN #02-06). Contact Rochester Electronics for Availability.
www.latticesemi.com/sales/discontinueddevicessales.cfm
Output Logic Macrocell (OLMC)
The GAL26CLV12D has a variable number of product terms per
OLMC. Of the twelve available OLMCs, two OLMCs have access
to twelve product terms (pins 20 and 22), two have access to ten
product terms (pins 19 and 23), and the other eight OLMCs have
eight product terms each. In addition to the product terms available
for logic, each OLMC has an additional product term dedicated to
output enable control.
The output polarity of each OLMC can be individually programmed
to be true or inverting, in either combinatorial or registered mode.
This allows each output to be individually configured as either active
high or active low.
The GAL26CLV12D has a product term for Asynchronous Reset
(AR) and a product term for Synchronous Preset (SP). These two
product terms are common to all registered OLMCs. The Asynchro-
nous Reset sets all registered outputs to zero any time this dedi-
cated product term is asserted. The Synchronous Preset sets all
registers to a logic one on the rising edge of the next clock pulse
after this product term is asserted.
NOTE: The AR and SP product terms will force the Q output of the
flip-flop into the same state regardless of the polarity of the output.
Therefore, a reset operation, which sets the register output to a zero,
may result in either a high or low at the output pin, depending on
the pin polarity chosen.
A R
D
Q
CLK
SP
Q
4 TO 1
MUX
2 TO 1
MUX
GAL26CLV12D OUTPUT LOGIC MACROCELL (OLMC)
Output Logic Macrocell Configurations
Each of the Macrocells of the GAL26CLV12D has two primary func-
tional modes: registered, and combinatorial I/O. The modes and
the output polarity are set by two bits (S0 and S1), which are nor-
mally controlled by the logic compiler. Each of these two primary
modes, and the bit settings required to enable them, are described
below and on the following page.
REGISTERED
In registered mode the output pin associated with an individual
OLMC is driven by the Q output of that OLMC’s D-type flip-flop.
Logic polarity of the output signal at the pin may be selected by
specifying that the output buffer drive either true (active high) or
inverted (active low). Output tri-state control is available as an in-
dividual product-term for each OLMC, and can therefore be defined
by a logic equation. The D flip-flop’s /Q output is fed back into the
AND array, with both the true and complement of the feedback
available as inputs to the AND array.
NOTE: In registered mode, the feedback is from the /Q output of
the register, and not from the pin; therefore, a pin defined as reg-
istered is an output only, and cannot be used for dynamic
I/O, as can the combinatorial pins.
COMBINATORIAL I/O
In combinatorial mode the pin associated with an individual OLMC
is driven by the output of the sum term gate. Logic polarity of the
output signal at the pin may be selected by specifying that the output
buffer drive either true (active high) or inverted (active low). Out-
put tri-state control is available as an individual product-term for
each output, and may be individually set by the compiler as either
“on” (dedicated output), “off” (dedicated input), or “product-term
driven” (dynamic I/O). Feedback into the AND array is from the pin
side of the output enable buffer. Both polarities (true and inverted)
of the pin are fed back into the AND array.
3
Test/Measurement
京公网安备 11010802033920号
EEWORLD
