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STK7422 Datasheet After reset or when processing a system management interrupt (SMI), the CPU executes from the top of memory. The processor is in Real mode and normally can address only l Mbyte, but the first instruction is fetched from address FFFFFO at the top of memory. The initial value of the code segment, CS, is FOOO, and the initial value of the instruction pointer, lP, is FFFO. However, the internal CPU base address associated with the code segment is FFOOOO rather than FOOOO. The processor can remain in this top 64 Kbytes of the available system memory address space by making near calls/jumps. If a far call/jump is executed and the CPU is still in Real mode at the time of this far control transfer, the far control transfer will cause the CS base address to be set t0 16 times the segment of the jump target. This is the normal Real mode behavior. Thus, the target of such a far jump must be in the lower 1 Mbyte. Many PC/AT-compatible BIOS implementations have a farjump to a target in segment FOOO as the first instruction executed. STK7422 Price
STK7422 on stock The Philips FZPTM CPLDs introduce the new patent-pending XPLATM (eXtended Programmable Logic Array) architecture. The XPLATM architecture combines the best features of both PLA and PALTM type structures to deliver high speed and flexible logic allocation that results in superior ability to make design changes with fixed pinouts. The XPLATM structure in each logic block provides a fast 10ns PALTM path with 5 dedicated product terms per output. This PALTM path is joined by an additional PLA structure that deploys a pool of 32 product terms to a fully programmable OR array that can allocate the PLA product terms to any output in the logic block. This combination allows logic to be allocated efficiently throughout the logic block and supports as many as 37 product terms on an output. The speed with which logic is allocated from the PLA array to an output is only 2.5ns, regardless of the number of PLA product terms used, which results in worst case tPD'S of only 12.5ns from any pin to any other pin. In addition, logic that is common to multiple outputs can be placed on a single PLA product term and shared across multiple outputs via the OR array, effectively increasing design density. NOTE V&+EFJ PLOTTNB CAP~CITAhjCE VEASLiS VOIT~t~ fT S COWENIEN7 TO PLOT LOG4_OG PIPEH AhiD TQ PLOT^PPLiE WH_TAaE PLVS ~HHifR POTIEhiI~L ~HAPfiIE:FI POTENTiAL . 0.7 VCd_TS)^S tfHE ~WdciStj.TH~S WILL GlirE ~ STFaAiOtff LIPJf OF SLtWE ~PPFNOXNATELir ll2 0F W}H C BE E^5iUr E7TfWW~TEnC^PNCITANCE AT ZEROH_EO vOLTS ~ FOUND ~T 01TS OHT f7LOO !ffifS TECIOlJE khiAS tiSE FOfl nrE CURVE SHOWPJ. |
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