Specifications

1260-14 User Manual
EADS North America Defense Module Specific Syntax 3-5
Test and Services, Inc. © 1992
Tri-State Control
Each port on the 1260-14 may be either tri-stated or write-enabled.
This may be controlled by either hardware, software or both. In
hardware, each port has an Enable Driver line (EDRVR 0-11) that
is tied to a logic high via an internal pull-up resistor. This allows
the software to either tri-state or write-enable the port's driver when
requested via the SETUP ENABLE command. The user may
override this at any time and force a port to the tri-state condition
by connecting a logic low to the appropriate EDRVR line. See
Table 3-1 for a detailed definition of this relationship. See Figure
3-2 for a block diagram of the tri-state control mechanism.
Table 3-1, Tri-state Control Truth Table
EDRVR State Software
Enable
Port Status
High True Write Enabled
Low True Tri-stated
High False Tri-stated
Low False Tri-stated
Figure 3-2, 1260-14 Tri-State Control
CH (n)
CH (n+7)
+5V
10K
EDRVR(Y)
{SOFTWARE CONTROL}
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