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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總線擴展器) |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, PQFP160 |
| 封裝： | 32 MM, PLASTIC, QFP-160 |
| 文件頁數(shù)： | 19/68頁 |
| 文件大小： | 928K |
| 代理商： | SYM53C140 |
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Interface Signal Descriptions
2-5
2.1.5 DIFFSENS Receiver
The SYM53C140 contains LVD DIFFSENS Receivers that detect the
voltage level on the A Side or B Side DIFFSENS lines to inform the
SYM53C140 of the transmission mode being used by the SCSI buses.
The LVD DIFFSENS Receivers are capable of detecting the voltage level
of incoming SCSI signals to determine whether it is from a single-ended,
LVD, or HVD device. A device will not change its present signal driver or
receiver mode based on the DIFFSENS voltage levels unless a new
mode is sensed continuously for at least 100 ms.
Transmission mode detection for SE, LVD, or HVD is accomplished
through the use of the DIFFSENS lines. Table 2.1 shows the voltages on
the DIFFSENS lines and modes they will cause.
2.1.6 Dynamic Transmission Mode Changes
Any dynamic mode change (SE/LVD/HVD) on a bus segment is
considered to be a catastrophic event that requires the initiator to
determine whether the mode change meets the requirements for that bus
segment.
The SYM53C140 supports dynamic transmission mode changes by
notifying the initiator(s) of changes in transmission mode (SE/LVD/HVD)
on A or B side segments via SCSI bus RESET. The DIFFSENS line is
used to detect a valid mode switch on the bus segments. After the
DIFFSENS state is present for 100 ms, the SYM53C140 generates a
SCSI reset on the opposite bus from the one that the transmission mode
change occurred on. This reset is used to inform any initiators residing
on the opposite segment about the change in the transmission mode.
The initiator(s) will then renegotiate synchronous transfer rates with each
device on that segment to ensure that there is a valid bus segment for
that mode.
Table 2.1
DIFFSENS 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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