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MA3693 датащи(PDF) 8 Page - Dynex Semiconductor

номер детали MA3693
подробное описание детали  1553B Bus Controller/Remote Terminal
PDF  41 Pages
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производитель  DYNEX [Dynex Semiconductor]
домашняя страница  http://www.dynexsemi.com
Logo DYNEX - Dynex Semiconductor

MA3693 датащи(HTML) 8 Page - Dynex Semiconductor

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CONTINUOUS OPERATION
The continuous message table
operation mode can be achieved by
ensuring that at the end of a message the
HALTREQN line is high. Thus, assuming
that the message has executed correctly,
the terminal will generate a signal to
increment the external address counter
(INCADRN) and continue to the next
instruction. If, however there has been an
interrupt generated (IRQN active) the
terminal will halt in the HALTEDN state
until specifically requested to continue.
Note that no address increment will take
place. To continue execution the
HALTREQN line should be taken low to
high for the appropriate time.
Continuous table driven operation
results in an intermessage gap of 20us.
Figure 1 shows the instruction fetch
and execute cycle.
Figure 1: BC Instruction Fetch and Execute Cycle
Has
HALTREQ
gone low to
high ?
NO
YES
Set HALTED high
Fetch Instruction
Message
Command
Error ?
YES
NO
Execute
Instruction
Retry
Required ?
Retry
Count = 0 ?
YES
NO
YES
NO
Decrement
Retry Count
Output
Report Word
INT.
Required ?
YES
NO
Pulse IRQ
Increment
Instruction Address
HALTREQ
= 0 ?
YES
NO
SET HALTED low



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