The SlimLine I2C expansion bus is managed with complex I2C commands, each command is composed by a write command followed by a read command. Are managed 256 commands each composed with multiple bytes, to each command sent by the CPU, the extension module creates the response frame that is read by the CPU.
The CPU module has to manage multitasking accesses, so all the I2C slave management is made with a FPGA logic to ensure the communication interoperability between the different tasks. All of this requires a management workload from the CPU and to avoid problems in the commands timing, we don’t publish any reference on how to manage the bus by a third party. So our I/O modules can be managed only by our CPU modules.
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