XYCOM XVME-956 Logic control module

Arithmetic and Logic Unit (ALU) is the computation element to operate integer arithmetic, logic, shift and other specialized operations. The operation data can be from instruction, accumulator or SRAM data memory. Computation result could be written into accumulator or SRAM. FPP0 and FPP1 will share ALU for its corresponding operation.

Oscillator and clock

 There are three oscillator circuits provided by PMC234/PMS234: external crystal oscillator (EOSC), internal high RC oscillator (IHRC) and internal low RC oscillator (ILRC), and these three oscillators are enabled or disabled by registers eoscr.7, clkmd.4 and clkmd.2 independently. User can choose one of these three oscillators as system clock source and use clkmd register to target the desired frequency as system clock to meet different application.

Internal High RC oscillator and Internal Low RC oscillator

 After boot-up, the IHRC and ILRC oscillators are enabled. The frequency of IHRC can be calibrated to eliminate process variation by ihrcr register; normally it is calibrated to 16MHz. The frequency deviation can be within 1% normally after calibration under the calibrated voltage, however, it still drifts slightly with supply voltage and operating temperature, the total drift rate is within ±6% for VDD=2.2V~5.5V and - 40o C~85o C operating conditions. Please refer to the measurement chart for IHRC frequency verse VDD and IHRC frequency verse temperature. The frequency of ILRC is around 24 KHz, however, its frequency will vary by process, supply voltage and temperature, please refer to DC specification and do not use for accurate timing application.

                                                                        

Application industry

The products can be used in the following industries: power plant, paper making, steel, mining, rubber, water supply, cement, chemical industry, glass, printing

Textile, machinery, plastics, coatings, medicine, hospitals, food, hotels, scientific research institutions

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