enCoRe™ V CY7C643xx, enCoRe™ V LV CY7C604xx TRM, Document No. 001-32519 Rev *H
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block
1. A functional unit that performs a single function, such as an oscillator.
2. A functional unit that may be configured to perform one of several functions, such as a digital
block or an analog block.
Boolean Algebra
In mathematics and computer science, Boolean algebras or Boolean lattices, are algebraic
structures which “capture the essence” of the logical operations AND, OR and NOT as well as
set the theoretic operations union, intersection, and complement. Boolean algebra also defines a
set of theorems that describe how Boolean equations can be manipulated. For example, these
theorems are used to simplify Boolean equations which reduces the number of logic elements
needed to implement the equation.
The operators of Boolean algebra may be represented in various ways. Often they are simply
written as AND, OR, and NOT. In describing circuits, NAND (NOT AND), NOR (NOT OR), XNOR
(exclusive NOT OR), and XOR (exclusive OR) may also be used. Mathematicians often use +
(for example, A+B) for OR and for AND (for example, A*B) (because in some ways those oper-
ations are analogous to addition and multiplication in other algebraic structures) and represent
NOT by a line drawn above the expression being negated (for example, ~A, A_, !A).
break-before-make
The elements involved go through a disconnected state entering (‘break”) before the new con-
nected state (“make”).
buffer
1. A storage area for data that is used to compensate for a speed difference, when transferring
data from one device to another. Usually refers to an area reserved for I/O operations into
which data is read or from which data is written.
2. A portion of memory set aside to store data, often before it is sent to an external device or as
it is received from an external device.
3. An amplifier used to lower the output impedance of a system.
bus
1. A named connection of nets. Bundling nets together in a bus makes it easier to route nets
with similar routing patterns.
2. A set of signals performing a common function and carrying similar data. Typically repre-
sented using vector notation; for example, address[7:0].
3. One or more conductors that serve as a common connection for a group of related devices.
byte
A digital storage unit consisting of 8 bits.
C
C
A high level programming language.
capacitance
A measure of the ability of two adjacent conductors, separated by an insulator, to hold a charge
when a voltage differential is applied between them. Capacitance is measured in units of Farads.
capture
To extract information automatically through the use of software or hardware, as opposed to
hand-entering of data into a computer file.
checksum
The checksum of a set of data is generated by adding the value of each data word to a sum. The
actual checksum can simply be the result sum or a value that must be added to the sum to gen-
erate a pre-determined value.
chip
A single monolithic Integrated Circuit (IC). See also
.
clear
To force a bit/register to a value of logic 0.
