Avago Technologies LSI53C120 - Manual (Page 57)

B-5
sockets. This interface supports memory operations as defined in
PCMCIA Release 1.0 and later and is used by both Memory Cards and
I/O Cards.
Memory
Mapped A storage location or register is memory mapped when it is available to
be accessed using memory cycles. The register or storage location might
also be accessible using I/O cycles, in which it would also be I/O
mapped.
MHz Megahertz – Measurement in thousands of cycles per second. Used as
a measurement of data transfer rate.
microsecond ( s) One millionth of a second.
MSB Abbreviation for Most Significant Bit and Most Significant Byte. That
portion of a number, address or field that occurs left-most when its value
is written as a single number in conventional hexadecimal or binary
notation. The portion of the number having the most weight in a
mathematical calculation using the value.
MSG/ Message – Driven active by a target during the Message Phase. This
signal is received by the initiator.
nanosecond
(ns) One billionth of a second.
Negated A signal is negated or deasserted when it is in the state opposite to that
which is indicated by the name of the signal. Opposite of asserted.
Negation The act of driving a signal to the false state or allowing the cable
terminators to bias the signal to the false state (by placing the driver in
the high impedance condition).
ns nanoseconds.
PC Abbreviation for Personal Computer. Often used to refer to an 80x86
based computer system.
Parity A method of checking the accuracy of binary numbers. An extra bit,
called a parity bit, is added to a number. If even parity is used, the sum
of all 1s in the number and its corresponding parity is always even. If odd
parity is used, the sum of the 1s and the parity bit is always odd.