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MAQ3693NB View Datasheet(PDF) - Dynex Semiconductor

Part NameDescriptionManufacturer
MAQ3693NB 1553B Bus Controller/Remote Terminal Dynex
Dynex Semiconductor Dynex
MAQ3693NB Datasheet PDF : 41 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
MA3690/1/3
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.
Has
HALTREQ NO
gone low to
high ?
YES
Set HALTED high
Fetch Instruction
Message
Command
Error ?
YES
NO
Execute
Instruction
Retry
YES
Count = 0 ?
NO
Decrement
Retry Count
Pulse IRQ
YES
Retry
Required ?
NO
Output
Report Word
YES
INT.
Required ?
NO
Increment
Instruction Address
SET HALTED low
YES
NO
HALTREQ
=0?
Figure 1: BC Instruction Fetch and Execute Cycle
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