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參數(shù)資料
| 型號(hào)： | PLUS405-37A |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | PLD |
| 英文描述： | Programmable logic sequencers 16 】 64 】 8 |
| 中文描述： | OT PLD, 15 ns, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 327K |
| 代理商： | PLUS405-37A |
Philips Semiconductors
Product specification
PLUS405-37/-45
Programmable logic sequencers
(16
×
64
×
8)
1996 Nov 12
7
DETAILS FOR REGISTERS FOR PLUS405
STATE REGISTERS
J
K
Q
P
R
CLK
TO INIT LINE
TO AND
ARRAY
Detail B
19
INIT/OE
Detail A
P
s
OUTPUT REGISTERS
J
K
Q
P
R
CLK
TO INIT LINE
Detail C
F
n
FROM
PIN 1 CLK
FROM PIN 4
(I5/CLK)
Detail D
SP00254
COMPLEMENT ARRAY DETAIL
P63
P62
P2
P1
P0
A
B
C0
D
E
C1
C1
C0
TO OR ARRAY
SP00255
The Complement Array is a special sequencer feature that is often
used for detecting illegal states. It is also ideal for generating
IF-THEN-ELSE logic statements with a minimum number of product
terms.
The concept is deceptively simple. If you subscribe to the theory that
the expressions (/A * /B * /C) and (A + B + C) are equivalent, you will
begin to see the value of this single term NOR array.
The Complement Array is a single OR gate with inputs from the
AND array. The output of the Complement Array is inverted and fed
back to the AND array (NOR). The output of the array will be Low if
any one or more of the AND terms connected to it are active (High).
If, however, all the connected terms are inactive (Low), which is a
classic unknown state, the output of the Complement Array will be
High.
Consider the Product Terms A, B and D that represent defined
states. They are also connected to the input of the Complement
Array. When the condition (not A and not B and not D) exists, the
Complement Array will detect this and propagate an Active-High
signal to the AND array. This signal can be connected to Product
Term E, which could be used in turn to reset the state machine to a
known state. Without the Complement Array, one would have to
generate product terms for all unknown or illegal states. With very
complex state machines, this approach can be prohibitive, both in
terms of time and wasted resources.
Note that the PLUS405 has 2 Complement Arrays which allow the
user to design 2 independent Complement functions. This is
particularly useful if 2 independent state machines have been
implemented on one device.
Note that use of the Complement Array adds an additional delay
path through the device. Please refer to the AC Electrical
Characteristics for details.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PLUS405-37N | Programmable logic sequencers 16 】 64 】 8 |
| PLUS405-45 | Programmable logic sequencers 16 】 64 】 8 |
| PLUS405-45A | Programmable logic sequencers 16 】 64 】 8 |
| PLUS405-45N | Programmable logic sequencers 16 】 64 】 8 |
| PLUS405-55 | Programmable logic sequencer 16 】 64 】 8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PLUS405-37N | 制造商:NXP Semiconductors 功能描述: 制造商:NXP Semiconductors 功能描述:Simple, Programmable Logic Sequencer, 28 Pin, Plastic, DIP |
| PLUS405-45 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Programmable logic sequencers 16 】 64 】 8 |
| PLUS405-45A | 制造商:NXP Semiconductors 功能描述:Simple, Programmable Logic Sequencer, 28 Pin, Plastic, PLCC |
| PLUS405-45N | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Programmable logic sequencers 16 】 64 】 8 |
| PLUS405-55 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Programmable logic sequencer 16 】 64 】 8 |
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