XYCOM XVME-690 Sequence control module

POR (Power-On-Reset) is used to reset PMC234/PMS234 when power up, however, the supply voltage may be not stable. To ensure the stability of supply voltage after power up, it will wait 1024 ILRC clock cycles before first instruction being executed, which is tSBP and shown in the Fig. 5. After boot up procedure, the default system clock is ILRC; user should ensure that the power should be stable after boot up time.

Data Memory -- SRAM

 Fig. 7 shows the SRAM data memory organization of PMC234/PMS234, all the SRAM data memory could be accessed by FPP0 and FPP1 directly with 1T clock cycle, the data access can be byte or bit operation. Besides data storage, the SRAM data memory is also served as data pointer of indirect access method and the stack memory for all FPP units. The stack memory for each processing unit should be independent from each other, and defined in the data memory. The stack pointer is defined in the stack pointer register of each processing unit; the depth of stack memory of each processing unit is defined by the user. The arrangement of stack memory fully flexible and can be dynamically adjusted by the user.

For indirect memory access mechanism

the data memory is used as the data pointer to address the data byte. All the data memory could be the data pointer; it’s quite flexible and useful to do the indirect memory access. Since the data width is 8-bit, all the 208 bytes data memory of PMC234/PMS234 can be accessed by indirect access mechanism.

                                                                        

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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