2 / 4 page  FEA TURES (Continued) • Does not consume a SCSI ID • On-chip multi-mode LVDIink™ transceivers • Supports TolerANT ® transceiver technology • Can cascade up to three LSI53C141s • Complete support for SCSI-1, -2, & -3 • Completely independent of software APPLICA TIONS • Server clustering environments • Expanders create distinct SCSI cable segments which are electrically isolated from each other (See Figure 1) Refer to Figure 2 for the block level description of the LSI53C141. Re-timing Logic The SCSI signals, as they propagate from one side of the device to the other, are processed by logic which retimes them as necessary to guarantee SCSI bus signal timings. This logic is governed by the state machine control block. In addition, the re-timing logic contains numerous precision delay elements which are periodically calibrated by the precision delay control block. Precision Delay Control The precision delay control block provides calibration information to the re-timing logic block for it to maintain precise SCSI bus timing such as output pulse widths, setup and hold times, and etc. As the system voltage and temperature conditions vary over time, the precision delay control block will periodically update the delay settings in the re-timing logic to maintain constant and precise control over bus timing. LSI53C141 SCSI LVD Bus Expander Figure 1: Example of server clustering using LSI53C141 devices Shared Disk Subsystem SCSI Bus Expander Workstations and/or Clients Primary Server Secondary Server SCSI Bus Expander LVD LVD SE SCSI Bus Expander Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F0 2 6 Te m p o r a r y Di s a b l e On Of f Al a r m Fa n Po w e r Su p p l y Co n t r o l l e r Dr i v e St a t u s Po w e r Ac t i v e Sy s t e m 1, 2 2 , 2 3, 2 4 , 2 5, 2 1 , 3 2, 3 3 , 3 4, 3 5 , 3 1, 0 2 , 0 3, 0 4 , 0 5, 0 1 , 1 2, 1 3 , 1 4, 1 5 , 1 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F 026 Te m p o r a r y D i s a b l e On Of f Al a r m Fa n Po w e r Su p p l y Co n t r o l l e r Dr i v e St a t u s Po w e r Ac t i v e Sy s t e m 1, 2 2 , 2 3, 2 4 , 2 5, 2 1 , 3 2, 3 3 , 3 4, 3 5 , 3 1, 0 2 , 0 3, 0 4 , 0 5, 0 1 , 1 2, 1 3 , 1 4, 1 5 , 1 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F0 2 6 Po w e r Ac t i v e Fa u l t F 026 Te m p o r a r y D i s a b l e On Of f Al a r m Fa n Po w e r Su p p l y Co n t r o l l e r Dr i v e St a t u s Po w e r Ac t i v e Sy s t e m 1, 2 2 , 2 3, 2 4 , 2 5, 2 1 , 3 2, 3 3 , 3 4, 3 5 , 3 1, 0 2 , 0 3, 0 4 , 0 5, 0 1 , 1 2, 1 3 , 1 4, 1 5 , 1 SE LAN Backbone 2 |
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