MOTOROLA MVME705-1 Speed module

SSI Protocol The following figure shows how a 7264 reads data from a SSI transducer. Note that the formal SSI definition allows for twenty-four bits of data and a twenty-fifth stop bit. However, AMCI is aware of some transducers that transmit more or less than twenty-five bits. To accommodate these transducers, the 7264 can be programmed to accept up to thirty-two bits in the SSI bit stream.

The first falling edge of the clock signal latches the SSI data. 

Note: Some transducers latch the data at the end of the previous interrogation. 2. The next “n” rising edges of the clock shift out the “n” data bits. 3. TINT is the time between interrogations and is equal to (((1/clock frequency) * # of SSI bits) + Idle Time) for the 7264. TM is the time that the Stop bit is valid, which is typically 12 to 20 µS. TIDL is the time between the end of the last interrogation and the start of the next and varies with the number of channels that the 7264 module has been configured to use.The transducer must have new data available within the TIDL Time period if the system is to work properly

                                                                        

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