UTOPIA Level 2 Slave MegaCore Function
from Altera Corporation
Features- Conforms toUTOPIA level 2, version 1.0, June 1995specification
- 8-bit or 16-bit UTOPIA bus operation and local bus widths of 8 or 16 bits
- Single physical layer (SPHY) operation, with both octet-level and cell-level handshaking
- Multi-PHY (MPHY) operation, with singleclavsignal
- Parity generation and detection
- Optional cell discard on parity error detection
- Internal four-cell, FIFO buffers supported for both transmit and receive
- AtlanticTM interface, which is a packet-based interface that is compatible with other Altera®cell and packet MegaCore®functions
- Intellectual property (IP) functional simulation models for use in Altera-supported VHDL and Verilog HDL simulators
- Easy-to-use IP Toolbench interface
- Support for OpenCore Plus evaluation
General DescriptionThe UTOPIA Level 2 Slave MegaCore function is designed for use in PHY layer devices that transfer data to and from Asynchronous Transfer Mode (ATM) devices using the standard UTOPIA bus. The MegaCore function contains a separate transmitter and receiver; both of which support SPHY and MPHY operation modes. The SPHY mode supports octet-level or cell-level handshake; the MPHY mode supports cell-level handshake. The transmitter is polled by the ATM layer to determine if it is ready to receive data transfers. The transmitter accepts cells from the ATM layer via the UTOPIA bus interface and sends them to the PHY devices. It detects and discards cells that are too short and discards excess bytes from cells that are too long. It also checks for parity errors on the UTOPIA bus. There is an option to discard cells with detected parity errors. The receiver is polled by the ATM layer to determine if it is ready to transfer data. The receiver accepts cells from the PHY layer and sends them to the ATM layer device via the UTOPIA bus interface. There is an option to generate parity information for the UTOPIA bus. Figure 1 illustrates data flow using the UTOPIA Level 2 Slave MegaCore function. Figure 1. UTOPIA Block Diagram 
Atlantic InterfaceThe Atlantic interface allows a consistent interface between all Altera cell and packet MegaCore functions. The Atlantic interface is only designed to support a point-to-point connection. You must choose whether you use the local or Atlantic interface. Figure 2 shows examples of the Atlantic interface. Figure 2. Atlantic Interface 
For more information on the Atlantic interface, refer toFS 13: Atlantic Interface(PDF). OpenCore Plus EvaluationUse theAltera OpenCore Plus evaluation flow to test drive this IP core. PerformanceTypical expected performance and utilization figures for this MegaCore function are provided in theUTOPIA Level 2 Slave MegaCore Function User Guide(PDF). Technical SupportFor technical support on this MegaCore function, please visit theAltera mySupport online issue tracking system. Related Documents
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