Features: • Compliant with ATM-Forum af-phy-0039.000, June 1995 specification
• Implements two Utopia L2 Masters providing a solution to bridge Utopia Slave devices
• Single chip solution for improved system integration
• Supports cell level transfer mode
• Meets 50MHz performance offering up to 400Mbps cell rate transfers
• Cell and clock rate decoupling with on chip FIFOs
• Up to 1.5 KByte of on chip FIFO per data direction
• Integrated management interface and built-in errored cell discard
• ATM Cell size programmable via external pins from 16 to 128 bytes
• Optional Utopia parity generation/checking enable/disable via external pin
• Built in JTAG port (IEEE1149 compliant)
• Simulation model available for system level verification (Contact Quicklogic for details)
• Solution also available as flexible Soft-IP core, delivered with a full device modelization and verification testbenchesDescriptionThe Utopia (Universal Test & Operations PHY Interface for ATM) interface QLUM2208-PT280C is defined by the ATM Forum to provide a standard interface between ATM devices and ATM PHY or SAR (segmentation and Re-assembly) devices.
The Utopia Standard of QLUM2208-PT280C defines a full duplex bus interface with a Master/Slave paradigm. The Slave interface responds to the requests from the Master. The Master performs PHY arbitration and initiates data transfers to and from the Slave device.
The ATM forum of QLUM2208-PT280C has standardized the Utopia Levels 1 (L1) to 3 (L3). Each level extends. the maximum supported interface speed from OC3, 155Mbps (L1) over OC12, 622Mbps (L2) to 3.2Gbit/s (L3).
The following Table 1 gives an overview of the main differences in these three levels.
Utopia Level 1 of QLUM2208-PT280C implements an 8-bit interface running at up to 25MHz. Level 2 adds a 16 Bit interface and increases the speed to 50MHz. Level 3 extends the interface further by a 32 Bit word-size and speeds up to 104MHz providing rates up to 3.2 Gbit/s over the interface.
In addition to the differences in throughput, Utopia Level 2 of QLUM2208-PT280C uses a shared bus offering to physically share a single interface bus between one master and up to 31 slave devices (Multi-PHY or MPHY operation). This allows the implementation of aggregation units that multiplex several slave devices to a single Master device. The Level 2 and Level 3 of QLUM2208-PT280C are pointto- point only, whereas Level 1 has no notion of multiple slaves. Level 3 still has the notion of multiple slaves, but they must be implemented in a single physical device connected to the Utopia Interface.
QLUM2208-PT280C Data Sheet
