LSI SYM8953U - Manual (Page 77)

3.75 pc 10.25 pc 11.25 pc 38.25 pc
4.333 pc
48.583 pc
52.5 pc
34.5 pc
44.25 pc
B-5
PIO Programmed Input/Output. A way the CPU can transfer data to and from
memory using the computer’s I/O ports. PIO is usually faster than DMA,
but requires CPU time.
Port Address Also Port Number. The address through which commands are sent to a
host adapter board. This address is assigned by the PCI bus.
Port Number See Port Address.
Queue Tags A way to keep track of multiple commands that allow for increased
throughput on the SCSI bus.
RAM Random Access Memory. The computer’s primary working memory in
which program instructions and data are stored and are accessible to the
CPU. Information can be written to and read from RAM. The contents of
RAM are lost when the computer is turned off.
RISC Core LSI Logic SCSI chips contain a RISC (Reduced Instruction Set
Computer) processor, programmed through microcode scripts.
ROM Read Only Memory. Memory from which information can be read but not
changed. The contents of ROM are not erased when the computer is
turned off.
SCAM SCSI Configured AutoMatically. A method to automatically allocate SCSI
IDs using software when SCAM compliant SCSI devices are attached.
SCSI Small Computer System Interface. A specification for a high-performance
peripheral bus and command set. The original standard is referred to as
SCSI-1.
SCSI-2 The current SCSI specification which adds features to the original
SCSI-1 standard.
SCSI-3 The SCSI specification which adds features to the SCSI-2 standard.
SCSI Bus A host adapter and one or more SCSI peripherals connected by cables
in a linear chain configuration. The host adapter may exist anywhere on
the chain, allowing connection of both internal and external SCSI
devices. A system may have more than one SCSI bus by using multiple
host adapters.