Cypress enCoRe V CY7C643 Series, Техническое справочное руководство

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enCoRe™ V CY7C643xx, enCoRe™ V LV CY7C604xx TRM, Document No. 001-32519 Rev *H 251
state machine
The actual implementation (in hardware or software) of a function that can be considered to con-
sist of a set of states through which it sequences.
sticky
A bit in a register that maintains its value past the time of the event that caused its transition has
passed.
stop bit
A signal following a character or block that prepares the receiving device to receive the next
character or block.
switching
The controlling or routing of signals in circuits to execute logical or arithmetic operations, or to
transmit data between specific points in a network.
synchronous
1. A signal whose data is not acknowledged or acted upon until the next active edge of a clock
signal.
2. A system whose operation is synchronized by a clock signal.
T
tap
The connection between two blocks of a device created by connecting several blocks/compo-
nents in a series, such as a shift register or resistive voltage divider.
terminal count
The state at which a counter is counted down to zero.
threshold
The minimum value of a signal that can be detected by the system or sensor under consider-
ation.
transistors
The transistor is a solid-state semiconductor device used for amplification and switching, and
has three terminals. A small current or voltage applied to one terminal controls the current
through the other two. It is the key component in all modern electronics. In digital circuits, transis-
tors are used as very fast electrical switches, and arrangements of transistors can function as
logic gates, RAM-type memory, and other devices. In analog circuits, transistors are essentially
used as amplifiers.
tri-state
A function whose output can adopt three states: 0, 1, and Z (high-impedance). The function does
not drive any value in the Z state and, in many respects, may be considered to be disconnected
from the rest of the circuit, allowing another output to drive the same
net
.
U
user
The person using the enCoRe V device and reading this manual.
user modules
Pre-build, pre-tested hardware/firmware peripheral functions that take care of managing and
configuring the lower level analog and digital blocks. User modules also provide high level
API
(Application Programming Interface)
for the peripheral function.
user space
The bank 0 space of the register map. The registers in this bank are more likely to be modified
during normal program execution and not just during initialization. Registers in bank 1 are most
likely to be modified only during the initialization phase of the program.