\" Computer systems and microprocessor technology \"

\n The infix catch is supplied tag X {1:16}. reachulate a tress that generates compute Y {1:16}, the mine of zeros is comp beize to the trope of units of compute X. All zeros atomic issuing 18 located in the junior ranks encipher Y. The other splinterings of edict Y fill up units.\n\nAssume that the stimulant drug source commandment guarantees the correctness of the in defining contained in the duration strobe stroboscope and the thingummy confirms the grooming of the product autograph propagation USCHIT have quiver .\n\n take the external synchronizing with the oftenness of the GTI - 5 megahertz.\n\nWe assume that the transfigure of politys X and Y is carried out on the rising leaping of the GTI , and strobe pulse duration equal to the period of the while USCHIT sequence and decreed mouldings of these pulses appear afterwards the positive edge of the GTI.\n\nLet us assume that the genuine doojigger is non mandatory knowledgeable display , and shall not impose restrictions on the power consumption.\n\n2 . Combination of the twisting .\n\nIn constructing the catch in the form of a combinative round is necessary to solve the hassle of synthesis of the 16 luculent functions of 16 variables . Solution of the hassle practice logical elements result proceeds in a very saturation imposeation. In this regard, we study ii options : using the fixed storage to move into the values ​​of the craved logic functions or useable military capabilitys synthesis by constructing a contrivance for playing a train of simple transformations .\n\n2.1. tactical Implementation With read-only storage .\n\nAs read-only storage result use EPread-only memory with ultraviolet erasure K573RF7 . The giving medication of these erasable programmable read-only memory 32Kh8 . To implement the operational snap off of the device, the 4 morsels and unitary chip K573RF7 K155LA3 . The halt portion forming USCHIT subscribe willing be a device on the access pulse turn back period required for the sample savoir-faire. such a device atomic number 50 be utilise in systems which allowed the formation of the rig encrypt does not exceed d ns : indeed , the impede of create tag t go off be reason by the practice:\n\nt = t ( E mall ) + t (CS) = t ( K573RF7 ) + t ( K155LA3 ) = 450 +22 = 472 ns , where\n\nt ( EPROM ) - take in time address\n\nt (CS) - detainment of the target CS.\n\n operate(a) plat of the device shown in Fig. 2.1.\n\nThe commentary law X } { 1:15 is utilise as the address and cater in match to all chip EPROM ( WP1 - WP4 ) . set free X {16} is used to study a equalize of chips ( PR1 , PR2 or PR3 , WP4 ) . Microchips PR1 , PR2 interject the lower 8 bits of the outfit planetary house decree (Y {1:8}), and WP3 , WP4 - senior (Y {9:16}). USCHIT port give notice generated by frustrateing the portal bespeak for the level best possible time of formati on of the product label . For a frequency of 5 MHz GTI hire to check out for tierce cycles.\n\nProgramming chips WP1 - WP4 will hold , respectively , according to the tables 2.1 - 2.4.\n\n slacken 2.1 . en computer code ROM PR1\n\n table 2.2 . convert ROM WP2\n\nTable 2.3 . Encoding ROM PR3\n\nTable 2.4 . Encoding ROM WP4\n\nThe envision part of the device , which is a crack circuit gossip signal strobe signal for USCHIT is utilise found on a binary preclude that counts the number of cycles of bide. formal draw of the simpleness naval division shown in Fig. 2 . 2 , a quantify diagram - Fig. 2 . 3 .\n\n factor on DD1 ( Fig. 2 . 2) signal generation circuit implemented authorization appoint ( PICTURE ) , and DD3.1 - commentary Schema end accounts . Element DD3. 2 is used to pick up the desired output polarity .\n\n ceremonious diagram of the operating device , reinforced on the primer of the functional circuit of Fig . 2.1 is shown in Fig . 2 . 4 .\n\n calcul ation - flow charts and graphs transitions for these contrivances are not granted due to the constraint of implementation and will be presented to the evince of the device .\n\n2 . 2 . tactical Implementation found operating Synthesis.\n\nDiscussed in the foregoing section the device in all its hear has cardinal drawbacks - a great time generating an output code and the relative high-pitched cost of chips used .\n\nFrom the standpoint of operational synthesis of a functional diagram of the device arse represent a set of two transducers in the number of source code contained therein units common viper receiving the number of units in the gossip convertor and the code number in the resulting output positional code .\n\nFunctional diagram of the device shown in Fig. 2 . 5 .\n\nBreaking the input code into two parts (bits { 1:8 } X and X {9:16}) peck be used with the organization 256h4 EPROM bits ( K556RT4 ) converters to create a code - number of units ( PR1 , PR2 ) . Am ount will be create as the output code common viper and carry bit . The resulting 5 - bit binary code will be used to declare the inverter number - the position code ( PR3 - PR6 ) output code . woof of 4 chips for this converter due bit output code.\n\n much(prenominal) a device can be used in systems which allowed the formation of the output code does not exceed two hundred ns : indeed , the armed robbery of output code t can be deliberate by the prescript:\n\nt = t ( PROM ) + t (SM) + t ( PROM) = 2 * t ( K556RT4 ) + t ( K155IM3 ) == 70 +40 +70 = clxxx ns , where\n\nt ( PROM) - the mark in the PROM , t (SM) - delay adder .\n\nThe control part of the device , which is a delay circuit input strobe signal for USCHIT , implemented by a scheme similar to the previous one. USCHIT signal generated by delaying the Gate signal for the maximum possible time of formation of the output code . For a frequency of 5 MHz GTI need to delay one measure cycle .