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IA2910A Datasheet(PDF) 6 Page - InnovASIC, Inc |
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IA2910A Datasheet(HTML) 6 Page - InnovASIC, Inc |
6 / 19 page Page 6 of 19 IA2910A Preliminary Data Sheet Microprogram Controller Copyright © 1999, InnovASIC Inc. Customer Specific IC Solutions either identical to the YOUT output, or else one greater, as determined by CIn. For each instruction, one and only one of the three outputs PLn, MAPn, and VECTn is LOW. If these outputs control three-state enables for the primary source of microprogram jumps (usually part of a pipeline register), a PROM which maps the instruction to a microinstruction starting location, and an optional third source (often a vector from a DMA or interrupt source), respectively, the three- state sources can drive the DIN inputs without further logic. Several inputs, as shown in Table 2, can modify instruction execution. The combination CCn HIGH and CCENn LOW is used as a test in 9 of the 16 instructions. RLDn, when LOW, causes the DIN input to be loaded into the register/counter, overriding any HOLD or DEC operation specified in the instruction. OEn, normally LOW, may be forced HIGH to remove the IA2910A YOUT outputs from a three-state bus. The stack, a nine-word last-in, first-out 12-bit memory, has a pointer which addresses the value presently on the top of the stack. Explicit control of the stack pointer occurs during instruction 0 (RESET), which makes the stack empty by resetting the SP to zero. After a RESET, and whenever else the stack is empty, the contents of the top of stack is undefined until a PUSH occurs. Any POPs performed while the stack is empty put undefined data on the F outputs and leave the stack pointer at zero. Any time the stack is full (nine more PUSHes than POPs have occurred since the stack was last empty), the FULLn warning output occurs. This signal first appears on the microcycle after a ninth PUSH. No additional PUSH should be attempted onto a full stack; if tried, information within the stack will be overwritten and lost. |
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