Avago Technologies LSI53C825AE - Manual (Page 235)

TolerANT Technology Electrical Characteristics 6-7
6.2 TolerANT Technology Electrical Characteristics
The LSI53C825A features TolerANT technology, which includes active
negation on the SCSI drivers and input signal filtering on the SCSI
receivers. Active negation actively drives the SCSI Request,
Acknowledge, Data, and Parity signals HIGH rather than allowing them
to be passively pulled up by terminators.
Table 6.15 provides electrical
characteristics for SE SCSI signals. Figure 6.1 through Figure 6.5
provide reference information for testing SCSI signals.