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参数资料
| 型号： | MA3691 |
| 厂商： | Dynex Semiconductor Ltd. |
| 英文描述： | 1553B Bus Controller/Remote Terminal |
| 中文描述： | 1553B总线控制器/远程终端 |
| 文件页数： | 8/41页 |
| 文件大小： | 426K |
| 代理商： | MA3691 |
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MA3690/1/3
8/41
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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