Avago Technologies LSI53C120 - Manual (Page 56)

B-4 Glossary
I/O Cycle An I/O cycle is an Input (I/O Read) operation or Output (I/O Write)
operation that accesses the PC Card’s I/O address space.
I/O Mapped A storage location or register is I/O mapped when it is available to be
accessed using I/O cycles. The register or storage location might also be
accessible using memory cycles, in which case it would also be memory
mapped.
IREQ Interrupt Request – Alerts the host computer of a condition that needs
to be serviced. Most of the interrupts are individually maskable. The
Interrupt Request signal between a PC Card and a socket when the I/O
interface is active.
LBA Abbreviation for Logical Block Address.
Logical Block
Address A logical block address is a sequential address for accessing the blocks
on the storage media. The first block of the media is addressed as block
0 and succeeding blocks are numbered sequentially until the last block
is encountered. This is the traditional method for accessing peripherals
on an SCSI interface bus.
Logical Unit The logical representation of a physical or virtual device, addressable
through a target. A physical device can have more than one logical unit.
Low (logical
level) A signal is in the low logic level when it is below approximately 0.5 volts.
LSB Abbreviation for Least Significant Bit or Least Significant Byte. That
portion of a number, address or field that occurs right-most when its
value is written as a single number in conventional hexadecimal or binary
notation. The portion of the number having the least weight in a
mathematical calculation using the value.
LUN Logical Unit Number. Used to identify a logical unit.
Mandatory A characteristic or feature that must be present in every implementation
of the standard.
Memory Cycle A memory cycle is a memory read (using Output Enable) operation or
memory write (using Write Enable / Program) operation that accesses
the PC Card’s common memory or attribute memory address space.
Memory
Interface The memory interface is the default interface after power-up, PCMCIA
Hard Reset, and PCMCIA Soft Reset for both PCMCIA cards and