參數(shù)資料
型號(hào): 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): 23/68頁
文件大?。?/td> 630K
代理商: SYM53C141
Dynamic Mode Switching
2-5
2.5 Dynamic Mode Switching
The SYM53C141 supports dynamic transmission mode changes on the
bus segment that supports both LVD and SE (B-side SCSI bus). The
DIFFSENS circuitry detects a valid mode switch on the bus segment.
The new DIFFSENS state must be present for 100 ms before the
SYM53C141 declares a valid shift in transmission mode. The
SYM53C141 then generates a SCSI reset on the opposite bus (A-side
SCSI bus). This reset informs any initiators residing on this opposing
segment of the change in transmission mode. These initiators may then
analyze the integrity of this mode change versus performance
capabilities and conduct any necessary renegotiations.
2.6 DIFFSENS Receiver
The SYM53C141 contains an LVD DIFFSENS receiver that detects the
voltage level on the DIFFSENS line for purposes of informing the
SYM53C141 of the transmission mode being used by the B-side SCSI
bus. The LVD DIFFSENS receiver is capable of detecting the voltage
level of an incoming SCSI signal to determine whether it is from a
single-ended or LVD device. A device does not change its present signal
driver or receiver mode based on the DIFFSENS voltage level unless a
new mode is sensed continuously for at least 100 ms.
Transmission mode detection for SE or LVD is accomplished through the
use of the DIFFSENS line. Table 2-1 shows the corresponding voltages
and what mode they indicate.
Note: The maximum voltage allowed to this pin is 3.3 volts.
Table 2.1
DIFFSENS Voltage Levels
Mode
SE
LVD
Voltage
0.35 to + 0.5
0.7 to 1.9
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