IDT77V550

The IDT77V550 Switch Manager is a device developed to provide a simple method of communication between an external workstation/ processor and the IDT77V500 Switch Controller. An In-Band signalling technique is utilized to examine incoming ATM cells, determining if the cell is a Command Cell for the Switch Controller, and loads the command if appropriate. In the typical configuration (Figure 1), the IDT77V550 is located on the IDT77V400 port to receive both signalling cells and standard traffic cells. The Switch Manager does not have to be connected to a Switching Memory port if it is only receiving the signalling cells.

The Switch Manager has two cell streams which flow in opposite directions, and can both interpret an incoming cell and generate control cells as necessary. Figure 2 illustrates the basic block configuration of the Switch Manager. The Data Path Interface (DPI) is used on both the cell input and output ports of the IDT77V550. DPI is utilized on the IDT77V400 to provide both reduced pin count per port and to offer configuration flexibility.