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CDP1855CEX Fiches technique(PDF) 4 Page - Intersil Corporation |
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CDP1855CEX Fiches technique(HTML) 4 Page - Intersil Corporation |
4 / 16 page 4 Functional Description The CDP1855 is a multiply-divide unit (MDU) designed to be compatible with CDP1800 series microprocessor systems. It can, in fact, be interfaced to most 8-bit microprocessors (see Figure 5). The CDP1855 performs binary multiply or divide operations as directed by the microprocessor. It can do a 16N-bit by 8N-bit divide yielding a 8N-bit result plus and 8N- bit remainder. The multiply is an 8N-bit by 8N-bit operation with a 16N-bit result. The “N” represent the number of cascaded CDP1855's and can be 1, 2, 3 or 4. All operations require 8N + 1 shift pulses (See “DELAY NEEDED WITH AND WITHOUT PRESCALER”). The CDP1855 contains three registers, X, Y, and Z, which are loaded with the operands prior to an operation and contain the results at the completion. In addition, the control register must be loaded to initiate a multiply or divide. There is also a status register which contains an overflow flag as shown in the “CONTROL REGISTER BIT ASSIGNMENT TABLE”. The register address lines (RA0-RA1) are used to select the appropriate register for loading or reading. The RD/WE and STB lines are used in conjunction with the RA lines to determine the exact MDU response (See “CONTROL TRUTH TABLE”). When multiple MDU's are cascaded, the loading of each reg- ister is done sequentially. For example, the first selection of FIGURE 2. BLOCK DIAGRAM OF CDP1855 AND CDP1855C 22 BUS 7 21 BUS 6 20 BUS 5 19 BUS 4 18 BUS 3 17 BUS 2 16 BUS 1 15 BUS 0 11 REGISTER SELECT LOGIC 12 13 1 SELECT CONTROL SELECT Z SELECT Y SELECT X SELECT STATUS X SEQUENCE COUNTER RESET OUT 8 CLOCK 26 CN1 27 CN0 8 ADD/ SUBTRACT X REGISTER LOAD 8 SHIFT GENERATOR Y REGISTER LOAD STATUS REG 8 8 Y SEQUENCE COUNTER RESET OUT Z SEQUENCE COUNTER RESET OUT CHIP NO. SHIFT RESET Z REGISTER LOAD 8 SHIFT RESET 25 3 4 5 24 6 23 LOAD 10 7 2 9 RD/WE SHIFT CLEAR STB C.I. CTL. C.O./O.F. YL YR ZL ZR RA2 RA1 RA0 CE C.O. 14 28 VDD VSS CDP1855, CDP1855C |
Numéro de pièce similaire - CDP1855CEX |
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Description similaire - CDP1855CEX |
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