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State Machine Control
The state machine control block monitors SCSI bus protocol and other
internal operating conditions such as SCSI phase, location of initiator and
target, and various timer functions. This block provides input to the re-timing
logic which identifies how to properly handle SCSI bus signal re-timing and
protocol based on observed bus conditions.
Dynamic Mode Switching
The LSI53C141 is designed to support dynamic transmission mode
changes on bus segments which support both LVD and SE. The DIFFSENS
line is used to detect a valid mode switch on the multi-mode LVD bus segment.
For instance, when a SE device is plugged onto an LVD bus, the dynamic
mode switch feature is used to inform any initiators residing on the opposing
bus 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 re-negotiations.
Figure 2: LSI53C141 block diagram
Single-ended
Wide Ultra SCSI Bus
(A Sided)
Control
Signals
LVD or Single-enede
Wide Ultra SCSI Bus
(B Side)
40 MHz Clock Input
Chip Boundary
Re-timing
Logic
Precision
Delay
Control
State
Machine
Control
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