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參數(shù)資料
| 型號： | SYM53C141 |
| 廠商： | LSI CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | SCSI Bus Expander(SCSI總線擴(kuò)展器) |
| 中文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PQFP128 |
| 封裝： | PLASTIC, QFP-128 |
| 文件頁數(shù)： | 53/68頁 |
| 文件大?。?/td> | 630K |
| 代理商： | SYM53C141 |
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A-3
External
Configuration
All SCSI peripheral devices are external to the host enclosure.
External
Terminator
The terminator that exists on the last peripheral subsystem that
terminates the external end of the SCSI bus.
Free
In the context of bus free phase, “free” means that no SCSI device is
actively using the SCSI bus and, therefore, the bus is available for use.
Host
A processor, usually consisting of the central processing unit and main
memory. Typically, a host communicates with other devices, such as
peripherals and other hosts. On the SCSI bus, a host has an SCSI
address.
Host Adapter
Circuitry that translates between a processor's internal bus and a
different bus, such as SCSI. On the SCSI bus, a host adapter usually
acts as an initiator.
Initiator
A SCSI device that requests another SCSI device (a target) to perform
an operation. Usually, a host acts as an initiator and a peripheral device
acts as a target.
Internal
Configuration
All SCSI peripheral devices are internal to the host enclosure.
Internal
Terminator
The terminator that exists within the host that terminates the internal end
of the SCSI bus.
I/O
Input/Output
Driven by a target, controls the direction of data transfer on the SCSI
bus. When active, this signal indicates input to the initiator. When
inactive, this signal indicates output from the initiator. This signal is also
used to distinguish between the Selection and Reselection Phases.
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.
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.
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