Glossary |
RAM
Random Access Memory. Memory of which any byte can be accessed directly in a single memory cycle. Information can be read from and written to the memory.
Scatter/Gather
A device driver feature that allows the host adapter to modify the transfer data pointer so that a single host adapter transfer can transfer to many segments of memory in a single transfer, mini- mizing interrupts and overhead.
SCB
SCSI Control Block. The mechanism used in emulation mode to transfer control information to and from the board. This is equiva- lent to the mailbox in/out system used in standard mode.
SCSI
Small Computer System Interface.
SCSI ASC
SCSI Additional Sense Code. Byte 12 of the extended sense infor- mation. Provides a standardized description of the condition described by the sense information.
SCSI Device
A device attached to a Small Computer System Interface bus cable. The device may be an initiator, a target, or capable of both types of operation. The device may be a peripheral device, a host device, or a device mixing both roles.
Single-Ended
A term referring to the electrical characteristics of the signals used on the SCSI bus interface.
Single-Threaded Operation
Operation of the computing system such that only one program can be operating or active at a time. The computing system must wait until all resources are available before starting an operation and cannot start another operation until the first one is com- pleted. No overlapping of latencies or program operation occurs.
