IDT77V011

The IDT77V011provides the interface translation between a 4 or 8-bit Data Path Interface (DPI) and an 8 or 16-bit UTOPIA Level 2 interface. DPI offers a reduced device pin count and gives the IDT77V400 Switching Memory a high degree of port configuration flexibility.

By providing a smooth translation to the UTOPIA Level 2 multi-PHY interface, the IDT77V011 offers the opportunity to connect up to 31 PHY ports to a single 155Mbps port of the IDT77V400 Switching Memory.

The IDT77V011 can also provide both transmit and receive TAG Routing, with each direction being individually programmed. In the receive direction up to four bytes can be added to the cell. In the transmit direction up to four bytes can be removed from the cell. This makes the IDT77V011, when combined with the IDT77V400, an ideal component for DSLAM and 25Mbps applications where the user would like to implement OC-3 bandwidth of a single IDT77V400 port to a number of lower bandwidth ports.

The 77V011 utilizes In-Stream™ programming for its device configuration options. The cells are received on the DPI transmit interface, identified and sent to the internal cell interpreter for decoding and execution. In-Stream™ programming cells are transmitted based on a round-robin scheduler, which provides equal priority for each of the subports and the cell generator. This methodology is also used to communicate and configure the PHYs that are connected to the IDT77V011.

Other features include an EEPROM that holds information for initialization and Discovery/Identify cells, and a Management interface to access the PHY devices.