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PALCE22V10 COM'L: H-5/7/10/15/25,Q-10/15/25 IND: H-10/15/20/25
PALCE22V10Z COM'L: -25
IND: -15/25
PALCE22V10 and PALCE22V10Z
Families
24-Pin EE CMOS (Zero Power) Versatile PAL Device
DISTINCTIVE CHARACTERISTICS
x
As fast as 5-ns propagation delay and 142.8 MHz f
MAX
(external)
x
Low-power EE CMOS
x
10 macrocells programmable as registered or combinatorial, and active high or active low to
x
x
x
x
x
x
x
match application needs
Varied product term distribution allows up to 16 product terms per output for complex
functions
Peripheral Component Interconnect (PCI) compliant (-5/-7/-10)
Global asynchronous reset and synchronous preset for initialization
Power-up reset for initialization and register preload for testability
Extensive third-party software and programmer support
24-pin SKINNY DIP, 24-pin SOIC, and 28-pin PLCC
5-ns and 7.5-ns versions utilize split leadframes for improved performance
GENERAL DESCRIPTION
The PALCE22V10 provides user-programmable logic for replacing conventional SSI/MSI gates and
flip-flops at a reduced chip count.
The PALCE22V10Z is an advanced PAL
®
device built with zero-power, high-speed, electrically-
erasable CMOS technology. It provides user-programmable logic for replacing conventional zero-
power CMOS SSI/MSI gates and flip-flops at a reduced chip count.
The PALCE22V10Z provides zero standby power and high speed. At 30 µA maximum standby
current, the PALCE22V10Z allows battery-powered operation for an extended period.
The PAL device implements the familiar Boolean logic transfer function, the sum of products. The
PAL device is a programmable AND array driving a fixed OR array. The AND array is programmed
to create custom product terms, while the OR array sums selected terms at the outputs.
The product terms are connected to the fixed OR array with a varied distribution from 8 to16 across
the outputs (see Block Diagram). The OR sum of the products feeds the output macrocell. Each
macrocell can be programmed as registered or combinatorial, and active-high or active low. The
output configuration is determined by two bits controlling two multiplexers in each macrocell.
Publication#
16564
Amendment/0
Rev:
E
Issue Date:
November 1998
BLOCK DIAGRAM
CLK/I
0
1
11
I
1
- I
11
PROGRAMMABLE
AND ARRAY
(44 x 132)
8
10
12
14
16
16
14
12
10
8
RESET
OUTPUT
LOGIC
MACRO
CELL
OUTPUT
LOGIC
MACRO
CELL
OUTPUT
LOGIC
MACRO
CELL
OUTPUT
LOGIC
MACRO
CELL
OUTPUT
LOGIC
MACRO
CELL
OUTPUT
LOGIC
MACRO
CELL
OUTPUT
LOGIC
MACRO
CELL
OUTPUT
LOGIC
MACRO
CELL
OUTPUT
LOGIC
MACRO
CELL
OUTPUT
LOGIC
MACRO
CELL
PRESET
I/O
0
I/O
1
I/O
2
I/O
3
I/O
4
I/O
5
I/O
6
I/O
7
I/O
8
I/O
9
FUNCTIONAL DESCRIPTION
The PALCE22V10 allows the systems engineer to implement the design on-chip, by programming
EE cells to configure AND and OR gates within the device, according to the desired logic function.
Complex interconnections between gates, which previously required time-consuming layout, are
lifted from the PC board and placed on silicon, where they can be easily modified during
prototyping or production.
The PALCE22V10Z is the zero-power version of the PALCE22V10. It has all the architectural features
of the PALCE22V10. In addition, the PALCE22V10Z has zero standby power and unused product
term disable.
Product terms with all connections opened assume the logical HIGH state; product terms
connected to both true and complement of any single input assume the logical LOW state.
The PALCE22V10 has 12 inputs and 10 I/O macrocells. The macrocell (Figure 1) allows one of four
potential output configurations registered output or combinatorial I/O, active high or active low
(see Figure 1). The configuration choice is made according to the user’s design specification and
corresponding programming of the configuration bits S
0
- S
1
. Multiplexer controls are connected
to ground (0) through a programmable bit, selecting the “0” path through the multiplexer. Erasing
the bit disconnects the control line from GND and it is driven to a high level, selecting the “1” path.
The device is produced with an EE cell link at each input to the AND gate array, and connections
may be selectively removed by applying appropriate voltages to the circuit. Utilizing an easily-
implemented programming algorithm, these products can be rapidly programmed to any
customized pattern.
2
PALCE22V10 and PALCE22V10Z Families
Variable Input/Output Pin Ratio
The PALCE22V10 has twelve dedicated input lines, and each macrocell output can be an I/O pin.
Buffers for device inputs have complementary outputs to provide user-programmable input signal
polarity. Unused input pins should be tied to V
CC
or GND.
AR
D Q
CLK
Q
SP
S1
1
1
0
0
0
1
0
1
I/On
S
1
S
0
0
1
0
1
Output Configuration
Registered/Active Low
Registered/Active High
Combinatorial/Active Low
Combinatorial/Active High
S0
0
0
1
1
0
1
0 = Programmed EE bit
1 = Erased (charged) EE bit
16564E-004
Figure 1. Output Logic Macrocell Diagram
Registered Output Configuration
Each macrocell of the PALCE22V10 includes a D-type flip-flop for data storage and
synchronization. The flip-flop is loaded on the LOW-to-HIGH transition of the clock input. In the
registered configuration (S
1
= 0), the array feedback is from Q of the flip-flop.
Combinatorial I/O Configuration
Any macrocell can be configured as combinatorial by selecting the multiplexer path that bypasses
the flip-flop (S
1
= 1). In the combinatorial configuration, the feedback is from the pin.
PALCE22V10 and PALCE22V10Z Families
3
AR
D
CLK
SP
a. Registered/active low
Q
Q
S0 = 0
S1 = 0
S0 = 0
S1 = 1
b. Combinatorial/active low
S0 = 1
S1 = 0
S0 = 1
S1 = 1
AR
D
CLK
SP
c. Registered/active high
Q
Q
d. Combinatorial/active high
16564E-005
Figure 2. Macrocell Configuration Options
Programmable Three-State Outputs
Each output has a three-state output buffer with three-state control. A product term controls the
buffer, allowing enable and disable to be a function of any product of device inputs or output
feedback. The combinatorial output provides a bi-directional I/O pin, and may be configured as
a dedicated input if the buffer is always disabled.
Programmable Output Polarity
The polarity of each macrocell output can be active high or active low, either to match output
signal needs or to reduce product terms. Programmable polarity allows Boolean expressions to be
written in their most compact form (true or inverted), and the output can still be of the desired
polarity. It can also save “DeMorganizing” efforts.
Selection is controlled by programmable bit S
0
in the output macrocell, and affects both registered
and combinatorial outputs. Selection is automatic, based on the design specification and pin
definitions. If the pin definition and output equation have the same polarity, the output is
programmed to be active high (S
0
= 1).
Preset/Reset
For initialization, the PALCE22V10 has preset and reset product terms. These terms are connected
to all registered outputs. When the synchronous preset (SP) product term is asserted high, the
output registers will be loaded with a HIGH on the next LOW-to-HIGH clock transition. When the
asynchronous reset (AR) product term is asserted high, the output registers will be immediately
loaded with a LOW independent of the clock.
4
PALCE22V10 and PALCE22V10Z Families
ARM技术
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