Appeal No. 96-1738
Application 08/040,428
1. An apparatus for translating SCSI control signals,
comprising:
first means for receiving a first plurality of control
signals from a single-ended SCSI bus;
second means for receiving a second plurality of control
signals from a differential SCSI bus, wherein one of said
first plurality and second plurality of control signals being
outputted by a target device and the other thereof being
outputted by an initiator device, said first plurality of
control signals having a first subgroup and said second
plurality of control signals having a second subgroup, wherein
each of said control signals in said first subgroup has a
counterpart signal in said second subgroup having the same
function, and in which each of said control signals in said
first subgroup and its counterpart in said second subgroup is
defined as a counterpart pair and said control signals of said
counterpart pair represent bidirectional SCSI signals, with
one of said counterpart pairs representing bidirectional reset
signals including a single-ended reset signal and a
differential reset signal; and
third means responsive to said first and second means for
controlling transmission of said counterpart pairs through
said apparatus, said third means including programmable array
logic and control logic circuitry communicating with said
programmable array logic, said programmable array logic
including input lines for inputting said counterpart pairs and
output lines for outputting two enable signals for each of
said counterpart pairs, said control logic circuitry having
input lines for inputting said counterpart pairs and being
responsive to said enable signals and transmitting or blocking
said signals in said counterpart pair in response to said
enable signals.
The following reference is relied on by the examiner:
Korpi 4,864,291 Sept. 5, 1989
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