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| 型号： | SYM53C180I2 |
| 厂商： | LSI CORP |
| 元件分类： | 总线控制器 |
| 英文描述： | SCSI BUS CONTROLLER, PBGA192 |
| 封装： | 23 X 23 MM, 1.27 MM PITCH, PLASTIC, BGA-192 |
| 文件页数： | 58/78页 |
| 文件大小： | 1073K |
| 代理商： | SYM53C180I2 |
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Symbios SYM53C180 Ultra3 SCSI Bus Expander
B-1
Appendix B
Glossary
ACK/
Acknowledge – Driven by an initiator, ACK/ indicates an acknowledgment
or a SCSI data transfer. In the target mode, ACK/ is received as a
response to the REQ/ signal.
ANSI
American National Standards Institute.
Arbitration
The process of selecting one respondent from a collection of several
candidates that request service concurrently.
Asserted
A signal is asserted when it is in the state that is indicated by the name of
the signal. Opposite of negated or deasserted.
Assertion
The act of driving a signal to the true state.
Asynchronous
Transmission
Transmission in which each byte of the information is synchronized
individually through the use of Request (REQ/) and Acknowledge (ACK/)
signals.
ATN/
Attention – Driven by an initiator, indicates an attention condition. In the
target role, ATN/ is received and is responded to by entering the Message
Out Phase.
Block
A block is the basic 512 byte size of storage that the storage media is
divided into. The Logical Block Address protocol uses sequential block
addresses to access the media.
BSY/
Busy – Indicates that the SCSI Bus is being used. BSY/ can be driven by
the initiator or the target device.
Bus
A collection of unbroken signal lines that interconnect computer modules.
The connections are made by taps on the lines.
Bus Expander
Bus expander technology permits the extension of a bus by providing
some signal ltering and retiming to maintain signal skew budgets.
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