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)： 26/68頁
文件大?。?/td> 928K
代理商： SYM53C140
2-12
Functional Descriptions
2.1.7.11 Chip Reset (RESET/)
This general purpose chip reset is intended to force all of the internal
elements of the SYM53C140 into a known state. It will bring the State
Machine to an idle state and force all controls to a passive state. The
minimum RESET/ input asserted pulse width is 100 ns.
The SYM53C140 also contains an internal Power On Reset (POR)
function that is ORed with the chip reset pin. This eliminates the need
for an external chip reset.
2.1.7.12 A and B Differential Sense (A_DIFFSENS and B_DIFFSENS)
These control pins are used to determine the mode of SCSI bus
signaling that will be expected.
For example, if a differential source is plugged into the B Side that has
been configured to run in the differential mode and if a single-ended
source is detected, then the B Side is disabled and no B Side signals will
be driven. This is a protection mechanism for single-ended interfaces that
are connected to differential drivers.
2.1.7.13 Warm Swap Enable (WS_ENABLE)
This input is used to remove the chip from an active bus without
disturbing the current SCSI transaction (for Warm Swap). When asserted
Table 2.4
RESET/ Control Signal Polarity
Signal Level State
Effect
LOW = 0
Asserted
Reset is forced to all internal SYM53C140 elements.
HIGH = 1
Deasserted SYM53C140 is not in a forced reset state.
Table 2.5
Mode Sense Control Voltage Levels
Voltage
Mode
-0.35 to +0.5
SE
+0.7 to +1.9
LVD
+2.4 to +5.5
HVD
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