參數(shù)資料
型號： SYM53C180
廠商： LSI Corporation
英文描述： Ultra3 SCSI Bus Expander(Ultra2 SCSI總線擴展器)
中文描述： 個Ultra3 SCSI總線擴展（Ultra2的SCSI總線擴展器）
文件頁數(shù)： 30/78頁
文件大?。?/td> 1073K
代理商： SYM53C180
2-12
Functional Descriptions
for an external chip reset if the power supply meets ramp up
specifications.
2.1.8.2 Warm Swap Enable (WS_ENABLE)
This input removes the chip from an active bus without disturbing the
current SCSI transaction (for Warm Swap). When Warm Swap Enable is
asserted, after detection of the next bus free state, the SCSI signals are
3-stated. This occurs so that the SYM53C180 no longer passes through
signals until the WS_ENABLE pin is deasserted HIGH and both SCSI
buses enter the Bus Free state. As an indication that the chip is idle, or
ready to be warm swapped, the XFER_ACTIVE signal deasserts LOW.
An LED or some other indicator could be connected to the
XFER_ACTIVE signal. This feature of WS_ENABLE is to isolate buses
in certain situations.
2.1.8.3 Transfer Active (XFER_ACTIVE)
This output is an indication that the chip has finished its internal testing,
the SCSI bus has entered a Bus Free state, and SCSI traffic can now
Table 2.3
RESET/ Control Signal Polarity
Signal Level State
Effect
LOW = 0
Asserted
Reset is forced to all internal SYM53C180 elements.
HIGH = 1
Deasserted SYM53C180 is not in a forced reset state.
Table 2.4
WS_ENABLE Signal Polarity
Signal Level
State
Effect
LOW = 0
Asserted
The SYM53C180 is requested to go off-line
after detection of a SCSI Bus Free state.
HIGH = 1
Deasserted
The SYM53C180 is enabled to run normally.
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