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參數(shù)資料
| 型號： | SYM53C140 |
| 廠商： | LSI CORP |
| 元件分類： | 其它接口 |
| 英文描述： | Ultra2 SCSI Bus Expander(Ultra2 SCSI總線擴(kuò)展器) |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, PQFP160 |
| 封裝： | 32 MM, PLASTIC, QFP-160 |
| 文件頁數(shù)： | 27/68頁 |
| 文件大小： | 928K |
| 代理商： | SYM53C140 |
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Interface Signal Descriptions
2-13
LOW, the chip will wait until the next SCSI Bus Free state, then reset
internally. Once reset, all SCSI activity will be ignored until the
WS_ENABLE pin is deasserted HIGH and both SCSI busses enter the
Bus Free state. As an indication that the chip is idle, or ready to be warm
swapped, the XFER_ACTIVE signal will deassert LOW. An LED or some
other indicator could be connected to the XFER_ACTIVE signal.
2.1.7.14 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
pass from one bus to the other. The signal is asserted HIGH when the
chip is active.
2.1.8 SCSI Termination
The terminator networks provide the biasing needed to pull signals to an
inactive voltage level, and to match the impedance seen at the end of
the cable with the characteristic impedance of the cable. Terminators
must be installed at the extreme ends of each SCSI segment, and only
at the ends. No SCSI segment should ever have more or less than two
terminators installed and active. SCSI host adapters should provide a
Table 2.6
WS_ENABLE Signal Polarity
Signal Level
State
Effect
HIGH = 1
Asserted
The SYM53C140 performs normal transfers
through the device
LOW = 0
Deasserted
The SYM53C140 discontinues transfers
through the device (off-line) upon detection of a
SCSI Bus Fee state
Table 2.7
XFER_ACTIVE Signal Polarity
Signal Level
State
Effect
HIGH = 1
Asserted
Indicates normal operation, transfers through
the SYM53C140 are enabled
LOW = 0
Deasserted
The SYM53C140 has detected a Bus Free
state do to WS_ENABLE being low disabling
transfers through the device
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