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MAR3693NE Datasheet(PDF) 8 Page - Dynex Semiconductor |
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MAR3693NE Datasheet(HTML) 8 Page - Dynex Semiconductor |
8 / 41 page 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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