The figure below is a typical functional block diagram of TSI products. There are two memory blocks shown in the figure - Data Memory and Connection Memory. Data Memory is a temporary buffer of all incoming serial streams. It can be read out by processor to access a particular DS0 in any input serial stream. But its contents can not be altered by system processor. Connection Memory can be read or written by the system processor. In processor mode (MOD[1:0] = 10), system processor can write data into Connection Memory locations to be routed into output serial streams. In other modes in which time- slot switching is enabled to connect any input time-slot to any output time-slot, Connection Memory must be configured accordingly. This is the basic function a TSI device accomplishes. Making a time-slot switching in TSI device is then nothing more than defining the “destination” and the “origin”. Connection Memory block has a 16-bit address and a 16-bit data. The address bits define the Destination; the data bits determine the Origin. Refer to application note AN-852 for more details. For other questions not addressed by the Knowledge Base, please submit a technical support request.