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IA2910A-PLC44C Datasheet(PDF) 8 Page - InnovASIC, Inc |
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IA2910A-PLC44C Datasheet(HTML) 8 Page - InnovASIC, Inc |
8 / 21 page IA2910A Data Sheet Microprogram Controller August 19, 2008 IA211030314-03 http://www.Innovasic.com Customer Support: Page 8 of 21 1-888-824-4184 The register/counter is operated during three microinstructions (8, 9, and 15) as a 12-bit down counter, with result = zero available as a microinstruction branch test criterion. This provides efficient iteration of microinstructions. The register/counter is arranged such that if it is preloaded with a number N and then used as a loop termination counter, the sequence will be executed exactly N + 1 times. During instruction 15, a three-way branch under combined control of the loop counter and the condition code is available. The device provides three-state YOUT outputs. These can be particularly useful in designs requiring automatic checkout of the processor. The microprogram controller outputs can be forced into the high-impedance state, and pre-programmed sequences of microinstructions can be executed via external access to the address lines. |
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