MOTOROLA MVME162P-252SE controller

The input and output data in the DP-RAM can directly be read and written, if no consistency data access necessary. In this case, input sema must have a constant, even value. Otherwise, the VME-PROF-Ssoftware would not read the input data. Note Word data are only copied consistency, if the data starts at an even address. Therefore the configuration should consists of an even number (0, 2, 4,....) of bytes in front of word data.

Consistency data access 

The consistency data transfer can be monitored through the semaphon control byte „Sema“. A consistency data access is necessary, if more than 2 bytes (= 1 word, see note above) must be processed as a block of data. For example a 3 byte (=24 bit) angle value. Bytes or words always handled consistency, without usage of sema. Reading consistency output data: The VMEbus-CPU must read sema two times, once before the output data are read and second after the output data are read. The output data can be used, if both sema-values are even numbered and equal (i.e. no DP-Slave data transfer occurs in the mean time).

                                                                        

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