LSI LSI53C1000, Technical Manual

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3-2 Signal Descriptions
The PCI Interface contains several functional groups of signals. The
SCSI Bus Interface contains one functional group of signals, as
illustrated in
Figure 3.1 .
There are five signal type definitions:
Figure 3.1 illustrates the signal groupings. Pinout information and
package drawings are available in Section 6.6, “Package Drawings.”
I Input, a standard input-only signal.
O Output, a standard output driver (typically a Totem Pole output).
I/O Input and output (bidirectional).
T/S 3-state, a bidirectional, 3-state input/output signal.
S/T/S Sustained 3-state, an active LOW 3-state signal owned and driven by
one and only one agent at a time.